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post #11 of 21
Quote:
Originally Posted by Relance View Post

LOL for sure its a bottle neck, I'm waiting on the ivy bridge to be released and then i'll upgrade. I just got a good deal on the 580's which is why I took it.
Booo. I just bought my TX 850 5 days ago as I was under the impression that it would be fine.
Do two 580's really need to be overclocked anyways? By border line, will my psu blow if I go under full load? Or will I be fine with stock speeds on the GPU's but leave my i3 OC'ed

What's the point of buying a 2nd 580 now if you won't get any performance from it? By the time Ivy Bridge is released new GPU's will be available, too.
post #12 of 21
Quote:
Originally Posted by Relance View Post


Booo. I just bought my TX 850 5 days ago as I was under the impression that it would be fine.
Do two 580's really need to be overclocked anyways? By border line, will my psu blow if I go under full load? Or will I be fine with stock speeds on the GPU's but leave my i3 OC'ed

Yeah, overclocking them is possible but honestly you won't notice any difference in performance because they're such high performing cards already. I wouldn't bother unless you're going for benchmarks/bragging rights.
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post #13 of 21
TX850 v2 will be fine even at 900MHz+ on both, unless you tend to disable the internal power regulation and go run Furmark. The only risk from the cards pulling more than the PSU can handle is from Furmark. Seriously.
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post #14 of 21
You'll be fine. I'm running my entire rig with 480s (which use a lot more power) with both gpus ocd and the max wattage from the wall (this is with prime95 runninG) was 739w.
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post #15 of 21
Thread Starter 
I got a 2nd 580 because, like I said, got a really good deal of them, I'd probably be able to resell them for more then I bought it for. Even if the 600 lineup came out, the 680 will still be around the same price as the current 580.
Quote:
Originally Posted by clerick View Post

You'll be fine. I'm running my entire rig with 480s (which use a lot more power) with both gpus ocd and the max wattage from the wall (this is with prime95 runninG) was 739w.
If that's the case, why do people sometimes recommend 1000w+? Is it just for lots of headroom?

I know there was the case of the PSU's actually blowing in the past (sparks, smoke, etc) is it still like that now? I mean, is there protection that shuts down your pc before something like that could happen?
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post #16 of 21
Quote:
Originally Posted by Relance View Post

I got a 2nd 580 because, like I said, got a really good deal of them, I'd probably be able to resell them for more then I bought it for. Even if the 600 lineup came out, the 680 will still be around the same price as the current 580.
If that's the case, why do people sometimes recommend 1000w+? Is it just for lots of headroom?
I know there was the case of the PSU's actually blowing in the past (sparks, smoke, etc) is it still like that now? I mean, is there protection that shuts down your pc before something like that could happen?

PSU that are larger actually save you money on your electricity bill, it's all to do with efficiency ratings etc.

A PSU that is running hardware it isn't capable of running will shut itself down. PSU are far more sophisticated than they used to be.
 
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post #17 of 21
Thread Starter 
Ah that's good to know.

So do you guys think I should upgrade my PSU to thermal take 1050w? Or an X4 1100w? Or should I just keep my TX850v2?

In the future I plan to upgrade to ivy bridge, as for GPU's I might still be sticking with my 580's SLI
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post #18 of 21
If you're able to then you should go ahead and upgrade to a 1000W or higher PSU. If you're limited to budget then the 850W will do fine for now. Basically, there's really nothing wrong with the current PSU, it will run 2x 580s SLI just fine. It is just better to have more headroom plus better efficiency with higher rated PSUs.
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post #19 of 21
Quote:
With 2-way SLI we noticed our power consumption for the cards peaked to roughly 719 Watts, that's quite something really, above two 480 actually which is strange to see with a card that supposedly has a lower TDP. Yet we also really need to mention that one of the boards used (engineering sample) had an older BIOS and that the power consumption on that board might be a tad higher as a result of it.

But let's take the worst case scenario just to play it safe:

Measured power consumption

System in IDLE = 237W
System Wattage with GPUs in FULL Stress = 719W
Difference (GPU load) = 482W
Add average IDLE wattage ~ 20W x2
Subjective obtained GPU power consumption = ~ 522 Watts


It'll be enough, the 719W mentioned was at the wall, meaning assuming 85% PSu efficiency that would be something like 611W, adding a further 100w for the rest of the system, your total power consumption will be around 700w, leaving you with 150w headroom to overclock. Granted you may not be able to get max overclock's with that PSU, however should be okay for a moderate overclock without straining the PSU.

EDIT:

Mind you this was done while stressing the gpu's therefore the load wattage will typically be less ie for when you're gaming or something.

While running crysis:

650
Edited by munaim1 - 11/20/11 at 5:06pm
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post #20 of 21
Thread Starter 
Alright, thanks for your input guys. As for a psu that's 1000w+, which would be better?
http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=7328076
http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=4558889&CatId=5436
http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=6389018&CatId=5436

Just between these three.
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