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[Various] Nvidia GeForce GTX Titan Reviews - Page 252  

post #2511 of 3575
Quote:
Originally Posted by Cloudfire777 View Post

1 GTX Titan draw max 263W.
http://tpucdn.com/reviews/NVIDIA/GeForce_GTX_Titan/images/power_maximum.gif
It contradicts itself it states it was left to stabelize at max load, but measurements were taken before the power limit kicked in.
post #2512 of 3575
Quote:
Originally Posted by Cloudfire777 View Post

1 GTX Titan draw max 263W.
http://tpucdn.com/reviews/NVIDIA/GeForce_GTX_Titan/images/power_maximum.gif

Which means that two of them would draw around 500w plus an overclocked cpu.. a quality 750w psu should work fine, 850w to be safe.
post #2513 of 3575
Quote:
Originally Posted by maarten12100 View Post

It contradicts itself it states it was left to stabelize at max load, but measurements were taken before the power limit kicked in.

What power limit?

Here is the Crysis 2 power consumption is anyone is interested: 238W
http://tpucdn.com/reviews/NVIDIA/GeForce_GTX_Titan/images/power_peak.gif
Quote:
Originally Posted by Phishy714 View Post

Which means that two of them would draw around 500w plus an overclocked cpu.. a quality 750w psu should work fine, 850w to be safe.

Yup I`d go atleast with 850W.
Add a 3770K which draw around 170W and you get around 700W. Gotta have room for overclocking too smile.gif
Edited by Cloudfire777 - 2/25/13 at 2:53pm
post #2514 of 3575
You want some headroom. Assuming you don't use any modified BIOS and keep the 263W limit that leaves 224W for the rest of the computer. I'd try to keep a minimum of 100W headroom otherwise your PSU will get loud, possibly hot, and it's not exactly efficient. It will probably lower the lifetime of the PSU too.

NVIDIA recommends a 850W for 2 Titans last I checked. On a 750W your going to be pulling the maximum the PSU can handle, with little to no headroom. Not saying it's not possible, but I personally wouldn't do it or recommend it even on a quality PSU.
Edited by Murlocke - 2/25/13 at 2:53pm
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post #2515 of 3575
Thread Starter 
With a 3770K and two titans I could go with a 850W unit but if you ever plan on SB-E or IB-E I'd bump that up another 100W at the very least.
 
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post #2516 of 3575
Quote:
Originally Posted by Murlocke View Post

You want some headroom. Assuming you don't use any modified BIOS and keep the 263W limit that leaves 224W for the rest of the computer. I'd try to keep a minimum of 100W headroom otherwise your PSU will get loud, possibly hot, and it's not exactly efficient. It will probably lower the lifetime of the PSU too.

NVIDIA recommends a 850W for 2 Titans last I checked. On a 750W your going to be pulling the maximum the PSU can handle, with little to no headroom. Not saying it's not possible, but I personally wouldn't do it or recommend it even on a quality PSU.

I totally agree with you. I always have a lot of headroom. Are PSUs made for 100% load btw?
post #2517 of 3575
Quote:
Originally Posted by Cloudfire777 View Post

I totally agree with you. I always have a lot of headroom. Are PSUs made for 100% load btw?

Their efficiency ratings are based on like 60-70% load. They can handle peak load, but it's not really ideal. It also seems dumb to spend $2000 on GPUs and not be willing to spend the $30 difference on a bigger PSU. I avoid small PSUs, which is why I just went all the way and got a 1200W even though I don't need it. It's future proof and you'll never run into "is this powerful enough?". It saves money in the long run. thumb.gif
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post #2518 of 3575
Quote:
Originally Posted by Murlocke View Post

Their efficiency ratings are based on like 60-70% load. They can handle peak load, but it's not really ideal. It also seems dumb to spend $2000 on GPUs and not be willing to spend the $30 difference on a bigger PSU. I avoid small PSUs, which is why I just went all the way and got a 1200W even though I don't need it. It's future proof and you'll never run into "is this powerful enough?". It saves money in the long run. thumb.gif

I always had that attitude too, buy way more than you'll need. Unfortunately, if i did go 4x Titans......a PSU upgrade would be needed. Again....!
 
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post #2519 of 3575
Quote:
Originally Posted by Murlocke View Post

Their efficiency ratings are based on like 60-70% load. They can handle peak load, but it's not really ideal. It also seems dumb to spend $2000 on GPUs and not be willing to spend the $30 difference on a bigger PSU. I avoid small PSUs, which is why I just went all the way and got a 1200W even though I don't need it. It's future proof and you'll never run into "is this powerful enough?". It saves money in the long run. thumb.gif

Pretty much agreed. General rule of thumb is don't "ride the line" so to speak when it comes to PSU's - when you're spending 2000$ on GPUs, I dont' see why anyone would skimp in any other respect. Fact is a 750W is awfully close to the limit and even if it does work (doubtful) you will have absolutely no room for overclocking whatsoever. Remember, overclocking increases power draw a TON - my lightning 680s have a total system draw of over 900W from the wall in furmark when I over volt them. At stock, it's not even close to that.

I'd consider 850W to be ideal for 2 titans, minimum.
post #2520 of 3575
I'm thinking the ax1200i digital power supply.

http://www.pccasegear.com/index.php?main_page=product_info&cPath=15_354&products_id=21504

I think the 860i isn't enough because I've always had thoughts to water cool at some stage and upgrading the psu was a definite. I can't see anything in between the 860i and the 1200i and corsair seem to make very reliable psus.
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