Corsair Vengeance RGB DDR5-8400 CUDIMM 48GB Dual-Channel Memory Kit Review

Introduction, Specifications, and Pricing

Corsair comes in guns blazing with one of their most attractive DDR5 kits to hit the market. Along with the styling, we are now getting to look at what Corsair is offering in CUDIMM configurations, and with the touted speed of this specific kit, we would venture to believe that we should be in for some chart-topping results from the Corsair crew. Considering that5 what we are presented for this review is 200 MT/s faster than anything we have seen in DDR5, we would be bummed if this is just "a number" hidden under some of the sexiest heat spreaders we have seen in quite some time.

Compared to standard motherboards, those with the capability to drive CUDIMM do it differently, or to be more specific, it is powered cleaner and with less noise than previous solutions. What that means to users is that thus far, we are seeing that voltage does not seem to help, but there does seem to be quite a bit of flexibility in these designs regarding overclocking. While we do not expect to get the same percentage as we found in the Crucial Classic, we feel that the rated speed may not be all this kit has to offer.

As one of the top five DRAM vendors on the planet, and from what we have seen from Corsair in the past, we feel we may have something special in our hands, but it will take a closer look and some testing to get that answer. For now, picture some fancy chromed aluminum heat spreaders, laser etched for a prism effect, with all of the RGB we are used to, built on a set of Hynix ICs with the fastest rating we have tested. If sexy sells, Corsair already has you half on their side of the fence. By the time you finish this review, you will likely be pondering hard whether these will be the visual highlight of your system and if they deliver the expected performance at this speed.

The exact product we have in hand is the CMHC48GX5M2X8400C40, and the stickers show these to be version 5.53.13, but it is the part number to the Vengeance RGB DDR5-8400 CUDIMM. Each stock sports two aluminum heat spreaders, one for either side, broken up with a diffuser for the ten-LED dynamic lighting. Each spreader has been chromed, which reflects everything and will show every fingerprint. Still, even so, the extra step of laser cutting prismatic lines into triangular shapes offers one of the most unique-looking sets of DDR5 on the planet.

Digging a bit deeper into these 24GB sticks, we find they boot with JEDEC settings at 5600 MT/s with 48-48-48-90 2T timings, sipping just 1.10V. If you have an Intel 800 series motherboard and an Ultra CPU, you, too, can employ XMP and have your Vengeance RGB CUDIMM running at 8400 MT/s with 40-52-52-135 2T timings but now require 1.40VDIMM.

All of that is contained in 137.8mm of length, 44.7mm of height, and 7.2mm of thickness. Each stick weighs 50.1 grams, which are some of the heaviest in the game.

Along with the same limited lifetime warranty that backs all the Corsair DRAM products to ease your mind about support for such a kit, there is one more hurdle your mind will have to heave you over. The current MSRP for this set of CUDIMM is $407.99. That is the price you will see shopping on the Corsair site. Amazon is slightly more affordable at $395.99, but it is Newegg with the current deal, selling this Vengeance RGB CUDIMM at $329.99. Any avenue you approach, you are paying a bleeding edge tax. As with anything new, there isn't much supply, and what is available will demand a high price. Even with a hefty cost associated with them, the aesthetics ease that pain. Still, the performance will decide whether many will pay to have this Corsair Vengeance RGB DDR5-8400 CUDIMM in their newest Intel PCs.

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Packaging and Corsair Vengeance RGB CUDIMM

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Corsair decides to keep packaging the same as previous Vengeance RGB samples sent our way, with the bright yellow top and matte black bottom, but this time sporting an interlocked cubic pattern. Back at the top, we see that these are Vengeance CUDIMM sticks; in the middle, it tells us this is a 48GB kit, and across the bottom, we see mentions of its performance, that it's Intel XMP ready and that it can utilize iCUE for lighting control.

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The back of the box covers features like the next-gen performance of CUDIMM, dynamic lighting via iCUE, and onboard voltage regulation for easier and more controlled overclocking. Other languages also express these around the cutouts showing the product stickers that match the one found next to the legal info at the bottom.

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The cardboard is honestly there for show and information delivery; the real protection comes from this form-fitting plastic packaging. Not only does it keep it from damage, but it also protects the surfaces. Although Corsair adds a layer of plastic on the chromed surfaces for added protection, most importantly, this removes the chance of static shock, ensuring the CUDIMM is alive and ready for use.

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In full view, the effort Corsair put into the diffusers is in full effect. At the top is a thick diffuser, allowing a ton of light out of the RAM and into your system. Below is a mix of chromed aluminum, on which the triangular shapes were laser etched, delivering the prismatic effect seen on the top stick. In the middle of all that chrome is a brushed metal sticker sporting the Vengeance name, placed in the center. There is even the //CUDIMM etched on the right edge, setting it apart from standard DDR5 offerings.

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While this view is meant to be of the product sticker, we took the time to adjust the lighting to show the best of the prism effect that Corsair offers with this. On the reverse, the product sticker replaces the brushed metal Vengeance one but shows you everything needed. On it, we are shown that this is DDR5, 48GB, 8400 MT/s, it runs with 40-52-52-135 timings at 1.40V, the version is 5.53.13; we see the part number and serial number, and that these are made in Taiwan.

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Close to how these would be seen in a build, we start to lose the prismatic effect across the entire stick, but you can always catch a few triangles sporting a portion of the rainbow. In the right light, even with white on gray on chrome as the color palette, a fair bit of contrast keeps these Vengeance RGB from disappearing into the background.

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The diffusers are angled down at both ends and relatively flat across the central portions, where the Corsair logo is applied with gray paint. Beneath the diffusers are ten LEDS in each stick, brighter than the sun at default settings, with adjustments and customizations available via iCUE software.

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Opening a stick shows us that Corsair actively cools the module's PMIC and CKD areas and offers the same thermal tape across the eight SK Hynix H5CG08MGB0 X021 ICs.

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In the center of the module, we found that the CKD chip at the bottom is made by RAMBUS, the PMIC is unlocked and made by MPS, and the SPD chip is a Montage product.

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The Vengeance RGB CUDIMM looks stunning in our build. The chrome portion has lost most of the prism effect but has now changed over to mirroring the motherboard components. Doing so makes that brushed metal Vengeance sticker pop, but as you can see, the brightness of the LEDs is insane out of the box, blowing out that portion of the image.

As we do, we offer Mem TweakIt screen captures to show you the full timing set for comparison with other DRAM. While most of the timings appear normal, the tRAS is a bit high for our liking, and the tREFi is also up there, but we understand that it is done for widespread compatibility.

Test System Details

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To obtain the Intel CPU-Z screenshots, you will see directly following this image; this is the system we used to do it, as well as to get the results seen in the following pages. Thanks to ASRock, our wallet, HYTE, Patriot, GIGABYTE, and be quiet! for supporting us with this venture. Detailed specifications of the system can be found below.

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With little more than a CMOS clear and a trip into the UEFI to enable XMP, we booted into Windows, finding our Vengeance RGB CUDIMM running as described. The Vengeance is at 8400 MT/s, timings are at 40-52-52-135 2T, and they use 1.40 VDIMM. We also saw our board delivering 1.35V for the IO and 1.408V through the System Agent.

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Corsair's timings are about as low as they were going to run with any stability. We could only change the tRCD and tRP and lower them to 50, but it is still stable with the timing set at 40-50-50-135 2T. Voltage adjustments did not help.

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An extra 400 MT/s in the tank, with little more effort needed than changing the DRAM speed, is pretty darn good. We took our Vengeance RGB CUDIMM to 8800 MT/s without touching anything else. Again, timing changes or voltage adjustments did not lead to increased speed.

Chad's Intel DDR5 Dual-Channel Test System Specifications

Intel Performance

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Sorry for the wrong-colored bars, but the XMP performance with AIDA read speed at 128,381 MB/s is a great way to kick off the performance portion of this review. While we did lose quite a bit of ground, to the tune of 2622 MB/s, reducing timings, that jump from the added speed to 131,211 bumps performance to 2730 MB/s over XMP.

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Write performance in AIDA diminishes from what we saw previously. XMP performance fails to break the 10K barrier, where our lowered timing run is more in line with what we expected XMP to offer. If you want to change the RAM speed a few notches, you will gain another 3993 MB/s over XMP, enough to outpace the Viper Extreme.

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Copy performance is where it should be, with all the options for running these Vengeance RGB CUDIMM, which would outpace the Patriot kit. With XMP delivering 109,613 MB/s, we have options for more performance. If you lower some secondary timings, you will gain 1542 MB/s, and with a RAM speed adjustment, we gained an astounding 7083 MB/s boost to copy performance.

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While the new Intel 800 series boards have increased latency over their 700 series options, the Corsair Vengeance CUSIMM shows well in the chart. At 81.4ns, they are not the best, but second in line. With some tuning, you can get the latency down to 72ns without hardly trying.

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Putting it bluntly, Super Pi and these Vengeance sticks do not get along. We ran this test multiple times to confirm, and these results are what we found. At XMP, Corsair got the slowest time of the group, and a timing reduction did not improve things much for Corsair. We can appreciate the second-place time at 8800 MT/s, but we feel it should have easily topped this chart.

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We have said it many times, and here again, PCMark 10 is more of an efficiency test that considers speed and timings over a vast array of tests. With both the XMP and lower timing runs scoring less than the Viper Extreme is a bit of a downer. However, the shining light here is the highest score we have hit with DDR5 at 10210 at 8800 MT/s with XMP timings still applied.

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If file compression is your game day to day, then you may want to consider something slightly slower with better timings, as it will get you the fastest time to compress a set size of files. While the stacking of scores is what we expected from the Vengeance RGB CUDIMM, we had hoped they would surpass the slower Patriot solution.

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Utilizing Handbrake to see how good the Vengeance RGB CUDIMM is at transcoding, XMP results are still bested by Patriot with less speed. Lowered timings tanked the results, and while 8800 MT/s topped the chart, it isn't by as much as we would have expected.

Final Thoughts

While we are giving leeway to the first few CUDIMM kits to hit the office for testing, as with any new tech, there are teething issues. We applaud those willing to put their reputation on the line to be first to the market with something so visually appealing and attractive specifications that lulled us into a stupor of amazement once we got this kit out of the box. Seeing all the effort that Corsair takes with the design of the heat spreader, we assumed that their attention to detail and other market performance is well within their purview, and the Vengeance RGB CUDIMM we were sent would have obliterated our charts. Sadly, that was not the case.

AIDA performance across the board was good, and outside of slightly lower than expected write performance, Corsair ran head-to-head with Patriot for the most part. Super Pi chewed up the Vengeance and spit them back out near the bottom of the chart, yet PCMar5k 10 didn't hate Corsair nearly as much. File compression times are fine; we just wanted them to surpass the 8200 MT/s kit, and Handbrake results are average, but again, not what we expected when we heard we were getting an 8400 MT/s kit of DDR5, CUDIMM or not.

The one feature on the box we strongly agree with is the ease of overclocking. From what we've seen thus far, with CUDIMM, you get it all, with no fundamental changes needed with voltage. Adjust until it fails, dial it back, and test for stability. While timing reduction was almost nonexistent, there was some movement, and we didn't even mess with the tREFi, which tightening it will bring a lot more oomph to this kit, but Corsair opts for wider stability over top-of-the-heap performance. At 8800 MT/s, things do open up, and the scores do top the charts, but when it comes to the final scores, overclocking abilities play a small part.

Ultimately, we are having a tough time with what to say. On the one hand, we are dealing with new technology, and manufacturers are learning as they go, just like we are, and there is some leeway for that. However, even as sexy as the Vengeance RGB CUDIMM are, they cost way too much for the performance you are given. We are basing that comment on the fact that you can currently have the Patriot Viper Extreme 5 for $169.99 and do just as good out of the box. There is much more involved in overclocking the Patriot, but XMP to XMP, we would opt for the PVE5.

With an MSRP of $407.99 and the best price of $329.99, you are a current iCUE environment user, absolutely love the aesthetic, or don't buy RAM based on performance. While we had a blast and love the styling, we did expect more from these Vengeance RGB CUDIMM at 8400 MT/s, and like many of you, we will end up with a massive hole in our bank accounts and a pinch of buyer's remorse knowing you could get faster RAM for much less money.