Test System Setup
Processor(s): Intel Core i7 920 @ 3.8GHz (190MHz x 20)
Cooling: Noctua NH-U12P (Supplied by Noctua)
Motherboard(s): ASROCK P55 Deluxe (Supplied by ASROCK)
Video Card: Gigabyte GTX 285 896MB (Supplied by GIGABYTE)
Hard Disk(s): Western Digital 300GB Velicorapter (Supplied by Western Digital)
Operating System: Windows 7
Drivers: ForceWare 191.07
Important Note: When modules are overclocked we adjust the BCLK which not only lets us fine tune the MHz out of a module, but in turn increases the overall CPU clock speed. While we always make the effort to include the BCLK and CPU speed in our graphs, please just make sure that you make note of these when looking at the results.
In some tests that don't purely test the memory speed, the extra MHz on offer from the CPU can increase the result. Of course, it's worth noting that having faster memory gives you the ability to run your CPU at a higher speed as well.
With not much luck when it came to overclocking, we'll today be seeing how the A-DATA X Series kit goes against the G.Skill Ripjaws with the same 2000MHz DDR setup. Instead, though, they'll run at 9-9-9-27 with a 2T command rate. We've also thrown in the PC3-15000 OCZ Platinum kit at its stock speed and the overclocked speed we achieved.
For specifics you can see all the important information in the graphs over the next few pages.
Let's get started!
wPrime uses a recursive call of Newton's method for estimating functions, with f(x)=x2-k, where k is the number we're sqrting, until Sgn(f(x)/f'(x)) does not equal that of the previous iteration, starting with an estimation of k/2. It then uses an iterative calling of the estimation method a set amount of times to increase the accuracy of the results. It then confirms that n(k)2=k to ensure the calculation was correct. It repeats this for all numbers from 1 to the requested maximum.
Under wPrime we can see that the two 2000MHz DDR kits sit quite close to each other. The more aggressive timings on offer from A-DATA don't really do anything for performance here.