NVIDIA GeForce RTX 3090 with custom BIOS: 20GB + 12GB GDDR6X tested

NVIDIA GeForce RTX 3090 tweaked with custom BIOS: 20GB GDDR6X (down from 24GB) on slower 320-bit memory bus, interesting results.

Published Jul 14, 2022 7:37 PM CDT   |   Updated Mon, Aug 8 2022 2:13 AM CDT
1 minute & 9 seconds read time

We are all waiting with massive amounts of anticipation for NVIDIA's next-gen Ada Lovelace GPU architecture and forthcoming GeForce RTX 40 series graphics cards... but before that, we have something interesting.

NVIDIA GeForce RTX 3090 with custom BIOS: 20GB + 12GB GDDR6X tested 01 | TweakTown.com

NVIDIA's second-fastest Ampere flagship GeForce RTX 3090 graphics card has had a custom BIOS installed, to see how it would perform with less memory, and on a slower memory bus. NVIDIA's GeForce RTX 3090 has 24GB of GDDR6X which was reduced to 20GB and 12GB in different tests, as well as its memory bus being dropped.

For the 20GB test, PRO Hi-Tech dropped down to a 320-bit memory bus, while for the 12GB test the memory bus was dropped to 192-bit. This reduced the memory bandwidth from NVIDIA's usual 936GB/sec on the GeForce RTX 3090 down to 780GB/sec with 20GB + 320-bit memory bus, and just 468GB/sec with 12GB + 192-bit memory bus.

NVIDIA GeForce RTX 3090 with custom BIOS: 20GB + 12GB GDDR6X tested 02 | TweakTown.com
NVIDIA GeForce RTX 3090 with custom BIOS: 20GB + 12GB GDDR6X tested 03 | TweakTown.com

The modder tested both 3DMark TimeSpy and 3DMark Port Royal benchmarks, as well as some games. NVIDIA's GeForce RTX 3090 at pure stock settings with its 24GB of GDDR6X memory with no adjustments hits 18388 points in the Graphics score, while the 20GB model + 320-bit memory bus drops to 17686 points, while the 12GB + 192-bit memory bus hits 13996 points: a large 24% or so drop from its normal performance.

NVIDIA GeForce RTX 3090 with custom BIOS: 20GB + 12GB GDDR6X tested 04 | TweakTown.com
NVIDIA GeForce RTX 3090 with custom BIOS: 20GB + 12GB GDDR6X tested 05 | TweakTown.comNVIDIA GeForce RTX 3090 with custom BIOS: 20GB + 12GB GDDR6X tested 06 | TweakTown.com

It shouldn't be a surprise that gimping the ultra-fast and huge chunk of 24GB of GDDR6X memory on the GeForce RTX 3090 to 12GB + 192-bit memory bus would drop performance so much, but... well... duh. We're looking at somewhere between 76% and 85% of the performance of the regular RTX 3090 with the 12GB + 192-bit memory bus BIOS, while you have most of (95-96%) of the performance dropping to 20GB + 320-bit memory bus.

Buy at Amazon

GIGABYTE GeForce RTX 3090 GAMING OC 24G (GV-N3090GAMING OC-24GD)

TodayYesterday7 days ago30 days ago
$1713.66$1481.39$1511.57
* Prices last scanned on 9/30/2022 at 8:50 pm CDT - prices may not be accurate, click links above for the latest price. We may earn an affiliate commission.
NEWS SOURCES:videocardz.com, youtu.be

Anthony joined the TweakTown team in 2010 and has since reviewed 100s of graphics cards. Anthony is a long time PC enthusiast with a passion of hate for games built around consoles. FPS gaming since the pre-Quake days, where you were insulted if you used a mouse to aim, he has been addicted to gaming and hardware ever since. Working in IT retail for 10 years gave him great experience with custom-built PCs. His addiction to GPU tech is unwavering.

Newsletter Subscription

    Related Tags

    Newsletter Subscription
    Latest News
    View More News
    Latest Reviews
    View More Reviews
    Latest Articles
    View More Articles
    Partner Content
    Advertise With Us