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I just replaced my Gainward GTX470 with a Gainward Phantom GTX580 3GB. The first test looked great. I use the 2.47 beta version as there are still too many bugs in 2.48+ versions. And I am really glad I did, as you can see the FPS which you can't in the newer builds.
As I was rendering away, I noticed my FPS started to drop. My test scene was at first runing at 5.05FPS but dropped to 3.83FPS after about 10 minutes of rendering a heavy scene. That's a big drop! I found out it was the temp on the card that was too high. I guess the GTX580 has a fail safe or the card just can't handle high temps. When it reached 97 degrees, the FPS started to drop and the temp wouldn't go higher than 98 degrees. The GTX580 was actually performing slower than my GTX470 at one point!

My PC tower has the sides off to get more air in, but in this case it was just not enough. I had to place a 120mm fan just outside the tower to blow air on the card. This fixed the problem and the temp lowered to 89 degrees at full load and I had stable FPS.

The temp on the Gainward Phantom should be 5-6 degrees lower than the reference cards, so I would guess some people in here would get the same problem I ran into. The only problem is that they would not noticed this, if they are using the 2.48+ versions, as you can't check the realtime speed since the FPS is gone in those versions. That's why I'm posting this.

The threshold seems to be around 97 degress where the performens will start to drop. So this is just a notice to GTX580 owners to check their temp now and then, as it would suck if the performens will drop and you don't know about it

Zay wrote:I just replaced my Gainward GTX470 with a Gainward Phantom GTX580 3GB. The first test looked great. I use the 2.47 beta version as there are still too many bugs in 2.48+ versions. And I am really glad I did, as you can see the FPS which you can't in the newer builds.
As I was rendering away, I noticed my FPS started to drop. My test scene was at first runing at 5.05FPS but dropped to 3.83FPS after about 10 minutes of rendering a heavy scene. That's a big drop! I found out it was the temp on the card that was too high. I guess the GTX580 has a fail safe or the card just can't handle high temps. When it reached 97 degrees, the FPS started to drop and the temp wouldn't go higher than 98 degrees. The GTX580 was actually performing slower than my GTX470 at one point!

My PC tower has the sides off to get more air in, but in this case it was just not enough. I had to place a 120mm fan just outside the tower to blow air on the card. This fixed the problem and the temp lowered to 89 degrees at full load and I had stable FPS.

The temp on the Gainward Phantom should be 5-6 degrees lower than the reference cards, so I would guess some people in here would get the same problem I ran into. The only problem is that they would not noticed this, if they are using the 2.48+ versions, as you can't check the realtime speed since the FPS is gone in those versions. That's why I'm posting this.

The threshold seems to be around 97 degress where the performens will start to drop. So this is just a notice to GTX580 owners to check their temp now and then, as it would suck if the performens will drop and you don't know about it

Zay

Try running Afterburner and under volt the card.You should be able to shave a few degrees off the temps doing this.

It may take a little bit of play around to find the sweet spot.I managed to shave 5 deg C off my GTX460 by under volting from the stock 0.95V to 0.875v.

You'll also consume less power as well !

Ehm, I don't have a problem now as mentioned in my post. The point was those people with a high temp on their GTX580, would get less performens. This was not the case with my old GTX470 (O/C) which could get up to 100 degrees with out problems .

Infact I O/C the GTX580 and running core at 851MHz, memory at 2125MHz and a shader clock at 1702MHz. Vroom vroom Still running temp at 89 degrees at full load.