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8800gt Volt Mod Question

P

Psience

n00b
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Oct 6, 2006
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So I performed the bios volt mod on my 8800gt that I have outfitted with an Accelero S1 and 120mm fan, but I don't seem to have gained any overclocking headroom from stock.

I'm pretty sure that volt mod was successful because idle temps went up about a degree from stock, and load temps went up about 2 degrees. The card idles at about 41C and maxes out at around 55C. Now, I never installed heatsinks on the pwm circuitry, but the fan is blowing air at them directly, does anyone think that this might be what's limiting my OC?
 
I got an 8800GT from EVA and OC'd it to SSC edition speeds, but hit a wall there with stock and aftermarket cooling. I believe that Nvidia prioritized production of 8800GTS chips and the chips that didn't pass validation were changed to 8800GT. That's why you'll see lots of GTS cards OC'ing well, and few 8800GTs with spectacular OC results.

Volt-modding through the bios .1V helped me get an extra 50MHz here and there, but I don't think I can get those 800MHz clocks without a larger Vmod.
 
To see any real benefit you're going to have to do the 'real' volt mod. The bios bios to 1.1 will gain you a little extra, but not much. If you do the real volt mod then you definitely will want to add decent heatsinks to the mosfets and whatnot.
 
I do not think so and agree with Flexion and I have decided that an extra 25Mhz is not worth voiding my warranty or compromising reliability with a hard volt mod.

Even the very first G92 GTs had little headroom for OCing. My EVGA SC will not do much over the factory settings despite watercooling, ramsinks and a slot fan blowing directly over the entire card. I can get much higher clocks (over 800MHz) using riviatuner or Atitool using the built in artifact scan etc. but the card will not do it in games. Many of the "wow" OCs at XS are just runs of artifact scans, the clocks will not hold up in games. I have installed 4 various EVGA versions of the 8800GT and have not found one that will really OC well. Of course there are exceptions.

I believe that Nvidia/manufactures have fine tuned the manuf process/testing so much that all of these chips are very accurately speed binned (because they have realized we will pay through the nose for a fast chip) that is is now rare to find a chip that will OC much past the factory settings. Conservative factory clock speeds with lots of room to OC are becoming a thing of the past as manufacturers realized they are loosing revenue.
 
Hmmm, that's interesting. My card is stable at 700/2000 with or without the bios mod, but if I go as high as 710-715 on the core, even with the mod, ati tool will start to error almost immediately. Its too bad as it seems like you get the most performance increase from increasing core speeds (its probably the higher shader speeds that do it though).

Luckily, the only game that needs those kinds of speeds right now seems to be Crysis so I've flashed my card back to a stock bios. Oh well, I can't complain about this card at all since its the best overclocker I've had since my GF3 Ti200 :)
 
dont bother. the 10 - 15% overclock you get will net you maybe 3% frame rate increase. video cards just dont scale well with overclocks anymore. but if this becomes common knowledge then bfg cant sell you 40mhz overclocked cards for an extra $75.
 
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