Anyways I just installed my new aftermarket cooler on my GTS 250 so i can overclock it, The new fan is 80mm x 80mm and it has a heatsink surrounding it and the heatsink is a fair size anyways i changed it mainly because I had problems with my 8800gt nvidia refrence cooler 3 years back and now i know that cooling is important if you overclock sometimes. Anyways do you think the 80mm x 80mm fan is to small should i change to a bigger fan?
Hmm I am not sure I would expect too much overclocking from a GTS250 to be honest. The GTS250 is just a rebranded 9800GTX+ and these cards basically pushed the G92 chip to it's limits. My EVGA 9800GTX+ idled at 28/29C with the stock cooler but still would only overclock a tiny bit. Less than 50mhz not enough to bother with really.
Those temps are mighty high, did you reapply thermal compound when you changed the cooler?
Now that the stock cooler is gone, is there anything cooling the RAM and/or VRM modules on the card? That Zalman cooler only cools the actual GPU. You may want to invest in some heatsinks to cool the other components.
These heatsinks work great for VGA memory modules. I've also used this kit before, which includes RAM and MOSFET / VRM heatsinks. But, it's outta stock...
Even 40c is not hot for idle of these gpu's. But I also don't think there is that much o/c headroom with them. 55nm is all done before , what I'm guessing from things I read, 800 ? http://www.overclock.net/nvidia/549402-maximum-gts-250-...
ATI 4 series clocked higher with their architecture.
The 40nm gpu's are a whole new breed.
So the OP is swapping out the stock cooler because he had previous heat issues with his 8800GT? AFAIK the 250's run cold, colder than the 9800GTX/9800GT with stock cooling. I have 2 of them and even when overclocked I have never seen them reach 65c unless running furmark @ 10% OC. The OP should be worried about his load temps, not his idle.
I kind of agree with OvrClkr and notty22. The GTS 250 doesn't really need extra cooling. Now, if anyone needs a better GPU cooler, it's my GTX 470! LOL
Even so, a 10C drop in idle temp is pretty good! Although I too wondered about VRAM temps just judging by the heatsink in the photo. Running GPU-Z should clear up the question about temperatures though. Run Furmark a few minutes with GPU-Z open and see how hot things get.