8800GTS 640, good OC?

Porter_

Porter_

[H]F Junkie
Joined
Sep 10, 2007
Messages
8,467
Recently built the rig in my sig, originally bought 8800GTS 320 but decided to return it for a 640. OC'd right after putting it in my system. Kind of strange, i ran into a 594MHz wall when OC'ing with ATItool. Used Rivatuner to keep going from there. Artifact free for 10min using ATItool's furry cube test. Went from 9700 to 11,200 in 3DMark06 (stock 640 vs OC'd). :D Gained about 10fsp (avg) in MOH:A.

*Processor stock @ 2.4GHz.

3DMark069-14-07.jpg
 
Nice bench Superkeijo. I know my 3DMark score would be higher if I overclocked my Q6600. From what i've read though i wouldn't see any benefit in real world gaming by OC'ing my proc (at least with current games). Did you see any real world gaming improvement when you OC'd your proc?

With this thread i was looking to gauge my GPU overclock against others. Looks like you squeezed more out of your GTS than i did. What brand of 8800GTS are you running? When you (or anyone else reading) OC'd did you experience any 'holes' where it appeared you had reached the card's peak but then found more headroom at higher clocks?
 
Brand doesn't matter. They're all built by Flextronics and just rebranded with stickers over the stock Nvidia sticker.
 
Well those clocks, GPU and CPU wise were pretty much most I could squeeze just to get one run of 3dmark. So those are not my 24/7 clocks :). I run my GTS at 648/1620/999 24/7 and I most certainly did notice a HUGE difference compared to stock settings. Especially at high resolutions (1920 x 1200 and 2560 x 1600). At 2560 x 1600 you're really going to need all the gpu power you can get, and I can't run most games maxed out at that resolution. As far as "holes" are concerned, these cards don't overclock in 1mhz steps, but more like 9-27 mhz steps for core and memory and 54 mhz for shaders. My card is Inno3D brand BTW.

As far as cpu overclocking, I haven't really been looking for real world differences, because the cpu does 3.2 GHz without a sweat, I leave it at that. HD movies is one thing where I most certainly did notice a big difference. I couldn't get HD movies to run smoothly at stock 1,8GHz, but at 3.2 they run smooth as butter. :)
 
Mild processor overclock: Q6600 @ 3.0GHz

3DMark063.0GHz.jpg


I think i need to get quality memory before I can overclock any more.
 
I just tested OCs on my new A3 revision 8800GTS 640MB from XFX. It is using the stock cooler in my new P180B w about a million 120mm fans (well, only 6 + PSU really).

I got to 684/1620/1080, and it loads in games at 67C (well, WoW is only ~62C) and at 70 with the ATITool "fuzzy cube" test. Bringing the core up to 702 causes my monitors to go "No signal".

I am hoping that this improves when I go to water in that case (will move to SLI with my orginal XFX 8800GTS 640MB at the same time).

I got 11035 in 3DMark06 w/ my 3Ghz e6600 and 2GB of ram @ PC2-6400 speed (<2450 CPU score).

The SM2.0 sore was: 5199
The SM3.0 score was: 5086

I can't wait till I have two of them running in SLI. :D
 
You most likely won't get any higher on the core or shader without a volt mod. The 'no signal' thing is caused by lack of voltage to the GPU, since your temps are well within spec still. I've seen higher from A3 GTSs -- they tend to clock higher than GTXs due to the revised core and less hardware to power -- but you're still doing very well, especially with those temps on air. Volt mods (obviously) void warranty... If you aren't willing to volt mod I wouldn't bother with water on that card.

My GTX tops out in almost the exact same place on high end water (dedicated loop, Swiftech MCR320 rad, Eheim pump, Aqua Computer block custom mounted). 684 core -- which is slightly unstable for me, clearly starting to run out of voltage on the GPU at that point -- 1620 shader (higher artifacts, also likely voltage related) and 1028 RAM (2056 DDR), partly because my airflow could be better as could the RAMsinks, and the RAM on my card is only rated for 1Ghz (2Ghz DDR). 38C idle 45C load at those speeds. I run 675Mhz core 24/7 because it's solid stable, and just bench occasionally at 684. I may volt mod at some point, but for now it's plenty fast.
 
silent-circuit said:
You most likely won't get any higher on the core or shader without a volt mod.
Click to expand...

I thought so, but I hoped for more anyway. :D


silent-circuit said:
The 'no signal' thing is caused by lack of voltage to the GPU, since your temps are well within spec still.
Click to expand...

Too bad the "no signal" part nails it as a voltage issue. I was so hopefull.

No biggie, though. 684 works for me. :D

Especially since my other card topped out at 675/1566/999.

At least it wasn't "594MHz". That would have bothered me. (I don't know why, when 513 is stock. :eek: )
 
It seems everyone with the A3 rev has no problems getting 999 on the memory. Mine just won't budge from 972. I can't really be too upset about this though seeing as these cards OC so well relative to other cards. Seems trivial to b!tch about free performance. :)
 
Speaking of...can anyone point me to a good review that contains performance gains on stock vs OC'd 640mb gts?
 
You must log in or register to reply here.
Back
Top