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Fermi Memory & Core/Shader overclocking in a vram limited game (Crysis 2).

post #1 of 2
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tl;dr = The faster your Core/Shader the greater the memory OC benefit becomes, however even at the highest levels the benefit of the memory overclock is only a 7% gain over underclocked ram in this scenario.

When overclocking core/shader should take priority, even underclocking the ram slightly if you can get more from them seems appropriate. However once you've reached your max stable core/shader clocks any additional vram overclocking will increase performance.

Test setup:

i5-2500k @ 5GHz
4GB DDR3 8-10-9-24 1T @ 2136MHz
GTX 470 SLI 1.25GB vram @ Varies

Crysis 2 - Central Park map
0xAA (causes flickering)
Laplace Edge Detection
DX11, High Res, Tess pack v1.9

All tests share the same core/share clock rate, the only thing that changes is the ram frequency.

Ram speeds tested:

1512MHz x 2 = Effect speed of 3024MHz
1612MHz x 2 = Effect speed of 3224MHz
1712MHz x 2 = Effect speed of 3424MHz
1812MHz x 2 = Effect speed of 3624MHz
1912MHz x 2 = Effect speed of 3824MHz
2012MHz x 2 = Effect speed of 4024MHz


Core/Shader clock speeds tested:

Stock: 607/1214

Overclocked: 880/1760


Crysis 2 has been reported to use over 1.5GB of vram at 1080p, the map selected also presents the greatest use of tessellation of the three possible choices. I also had 12 tabs opened in the background, which were taking up 276 vram on the desktop, I did this because it's typical for many people to do the same and represents an increased load on the overall system to see if if a lack of memory produced signification performance losses as seen when reaching a vram limit.

One thing of note is that Crysis 2 with the 1.9 patches does not like to go over 100 fps, which later in the testing caused some issues with fps scaling as the frame rate began to climb over this mark.

Stock:



Overclocked:




I hope someone finds this useful, gl overclocking
    
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Intel Core i5 2500K P8P67 PRO NVIDIA GeForce GTX 470 NVIDIA GeForce GTX 470 
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post #2 of 2
Not entirely following what you're doing here Balla.

Making graphs that illustrate the effects on FPS of the various memory clocks you are referring to above would make the 'point' I think you're trying to make ... a lot easier to understand.

I've always suggested the same thing ... get as much as you can out of core/shader, then add whatever mem OC you can get away with on top of that. There's no reason NOT to OC your memory, as long as you don't have to compromise core speed in the process.

I also agree that the higher your core/shaders, the more the memory OC should help raise FPS. And the reason for that should be practically self-explanatory

To give an example using #'s, if a +10% memory OC gives you +1% FPS increase at 500MHz core, there's a good chance that if you OC the core to 750MHz, the same +10% memory OC may well give you +2% instead of only +1%.
Edited by brettjv - 10/6/11 at 8:48am
    
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xeon X5675 6-core @ 4.1ghz (1.29v, 20x205 +ht ) rampage iii extreme msi rx470 gaming X (the $159 budget king) 3 x 2gb corsair xms3 pc12800 (9-9-9-24-1T@1600MHz) 
Hard DriveOptical DriveCoolingOS
hynix 250gb ssd (boot), 2tb deskstar (apps),1tb... plextor px-712sa - still the best optical drive... corsair h8o v2 aio W10 home 
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