I recently attempted to overclock my GTX 570 2.5 GB with limited success. I've been struggling to get the OC stable when bumping up the voltage. When I try and get the memory clock up around 2100 and the graphics clock around 900 the system starts crashing, and artifacts start appearing. Ive pushed the voltage up to 1.05 volts but that just seems to be making it more unstable, Temps are around 75c-85c when stress testing with furmark. This has lead me to think that something else is bottle-necking my system, here is my present build:
 
Graphics: EVGA 025-P3-1579-AR GeForce GTX 570 (Fermi) HD 2560MB
Mobo: EVGA E760 CLASSIFIED 1366 Intel X58 EATX Intel Motherboard
Processor: Intel Core i7-920 Bloomfield 2.66GHz LGA 1366 (Overclocked to 3.32ghz)
PSU: Rosewill BRONZE Series RBR1000-M 1000W Continuous@40°C
Ram: CORSAIR DOMINATOR 6GB (3 x 2GB) 240-Pin DDR3 1600
Overclocking Tools: EVGA PrecisionX
 
Does anyone see anything that could be slowing me down? I'm pretty new to GPU overclocking, so if anyone has any tips, that is also greatly appreciated.

At what point does it loose stability?  Are you finding an OC that works?  If you haven't already, take it in increments.  Bump the clocks a bit at a time until you start crashing or start seeing artifacts - then bump the voltage slightly - then repeat. 

EliteSniper177


I recently attempted to overclock my GTX 570 2.5 GB with limited success. I've been struggling to get the OC stable when bumping up the voltage. When I try and get the memory clock up around 2100 and the graphics clock around 900 the system starts crashing, and artifacts start appearing. Ive pushed the voltage up to 1.05 volts but that just seems to be making it more unstable, Temps are around 75c-85c when stress testing with furmark. This has lead me to think that something else is bottle-necking my system, here is my present build:

Graphics: EVGA 025-P3-1579-AR GeForce GTX 570 (Fermi) HD 2560MB
Mobo: EVGA E760 CLASSIFIED 1366 Intel X58 EATX Intel Motherboard
Processor: Intel Core i7-920 Bloomfield 2.66GHz LGA 1366 (Overclocked to 3.32ghz)
PSU: Rosewill BRONZE Series RBR1000-M 1000W Continuous@40°C
Ram: CORSAIR DOMINATOR 6GB (3 x 2GB) 240-Pin DDR3 1600
Overclocking Tools: EVGA PrecisionX

Does anyone see anything that could be slowing me down? I'm pretty new to GPU overclocking, so if anyone has any tips, that is also greatly appreciated.

Okay, 'bottleneck'. Defined loosely and subjectively as whatever part of your system is impacting performance the most. In your case, the GPU and CPU are fairly well matched. So we're left with the subjective aspect of why you're desiring more performance and for what.
Back to your issues on overclocking your GPU. Overclocking the memory, doesn't gain you much. If you must, 50hmhz is probably a safe amount that won't cause instability. Your GPU has denser memory chips than the standard 570 so is probably less capable of running the memory overclocked. So, I'd suggest sticking to a mild OC on the memory and work on finding the highest stable OC for your GPU core.
Secondarily, the CPU runs the show. It tells the GPU what to draw and runs others tasks while gaming. You'd probably see more of an increase in your gaming performance by overclocking your 920 to 3.8-4.0ghz that you will from overclocking your GPU. As a ballpark figure, combining the results of moderate overclocks on both your CPU and GPU you should be able to realize a consistent 15-20% increase in performance. Good luck.

Well after a few hours I'm still at a loss for how to get it stable, I've been benchmarking with fur mark, and in semi-random intervals furmark will display a message about throtteling, I've tried resetting the card to use default values, and im still getting the throtteling message. Is this a bad sign? or is furmark just not getting priority over the resources?

EliteSniper177


Well after a few hours I'm still at a loss for how to get it stable, I've been benchmarking with fur mark, and in semi-random intervals furmark will display a message about throtteling, I've tried resetting the card to use default values, and im still getting the throtteling message. Is this a bad sign? or is furmark just not getting priority over the resources?

Furmark is an application that is flagged to throttle in the driver as a protective feature to limit power draw. Your behavior is perfectly normal.  Basically the only thing I use it for is testing for cooling . So that isn't a sign of instability. 3Dmark 11 is much better for judging stability as well as just simply playing graphical intensive game like BF3 or Crysis 2. Both of which are fairly sensitive to unstable overclocks.