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Antec HCG 620 watt enough for R9 280x crossfire? - Page 2

post #11 of 22
I'd say no
I'm thinking you'd need 850w or better with 1 single rail or 2 large split ones.
HCG 900 biggrin.gif
 
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post #12 of 22
Quote:
Originally Posted by Schmuckley View Post

I'd say no
I'm thinking you'd need 850w or better with 1 single rail or 2 large split ones.
HCG 900 biggrin.gif

 

Pff.. wut. 1500W minimum. Go big or go home.

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post #13 of 22
Thread Starter 
I guess the other question I should ask is...

Would it be safe to try and see how it goes? As in nothing will go 'bang'?

And I realised I wrote the wrong stock voltage on the Gigabyte R9 280x. It is actually 1163v. But still... I've set it lower than that anyway.

6970 draws around 205w (from what I remember) on Guru 3d at stock clocks/volts. R9 280x 240ish. Both have a 250w TDP.

I overclocked and overvolted my 6970s. Even ran furmark with no issues.

Surely the power draw between a Overvolted/Overclocked 6950/6970 would not be much different to an Undervolted R9 280x?
post #14 of 22
Quote:
Originally Posted by Tobe404 View Post

I guess the other question I should ask is...

Would it be safe to try and see how it goes? As in nothing will go 'bang'?

 

Absolutely. That is what I've been trying to say. The worst that will happen is, the PSU will just harmlessly turn off.

 

Quote:
Originally Posted by Tobe404 View Post


And I realised I wrote the wrong stock voltage on the Gigabyte R9 280x. It is actually 1163v. But still... I've set it lower than that anyway.

6970 draws around 205w (from what I remember) on Guru 3d at stock clocks/volts. R9 280x 240ish. Both have a 250w TDP.

I overclocked and overvolted my 6970s. Even ran furmark with no issues.

Surely the power draw between a Overvolted/Overclocked 6950/6970 would not be much different to an Undervolted R9 280x?

 

Please review my posts. ;) (I'm short on time at the moment. So, I apologize for making you go back to earlier posts)

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post #15 of 22
Quote:
Originally Posted by Wirerat View Post

I had two 660ti on a seasonic 620 watt. The Msi PE/OC models claim they use 180watts instead of the reference 150watts. Anyways I could not over volts the cards at all. Even setting the CPU to stock there still was not enough headroom to overclock/overvolt.

I think two 280X will be way , way , too much power draw. Good Luck though.



Wow - My 3570K (4.2) + 2 660ti ( 1 PE/OC660ti + 1 MSI 660ti no OC on either) + monitor + speakers = 400W using killawatt meter at the wall (while folding). Surprised you could not OC those cards on that PSU.
Edited by lanofsong - 3/30/14 at 8:59am
post #16 of 22
Real World Current Experience with some similar hardware chiming in here.

I have a Antec HCG 620W. I run my 1090T(125w Processor) overclocked to 3.8Ghz and my HD7950(280X equivelent?) overclocked to 1100/1500 at stock voltages on this PSU and don't have an issue. He should be okay IMO, but barely. I would shoot for a slightly higher PSU for future upgrade in the near future if the HCG is what you currently have.
Edited by Erick Silver - 3/30/14 at 9:05am
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post #17 of 22
Quote:
Originally Posted by Erick Silver View Post

Real World Current Experience with some similar hardware chiming in here.

I have a Antec HCG 620W. I run my 1090T(125w Processor) overclocked to 3.8Ghz and my HD7950(280X equivelent?) overclocked to 1100/1500 at stock voltages on this PSU and don't have an issue. He should be okay IMO, but barely. I would shoot for a slightly higher PSU for future upgrade in the near future if the HCG is what you currently have.
7950 = 280, 7970= 280x. Still very close power consumption.
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post #18 of 22
In regards to my last post. It was pointed out to me that the OP was wanting to run in crossfire. Something that I missed due to just rolling out of bed. My apologies.

However, if you were only going to use 1 GPU then my post would still be valid. 2 GPUs then you would need a larger PSU.
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post #19 of 22

No. No, no, no. Again:

 

http://www.guru3d.com/articles_pages/asus_radeon_r9_280x_top_review,8.html

 

With one 280X under full load in their system, their PSU pulled 352W from the wall outlet. They calculated from this power consumption test that their video card pulled 243W by itself. So, I will just add 245W to 352W for two 280Xs in Crossfire. This makes the PSU pulling 597W from the wall outlet. Their CPU was idling and the i5-2400 is a 95W TDP CPU, so adding 95W to 597W makes the PSU pulling 692W from the wall outlet. So, this means that if the PSU is 85% efficient while pulling 692W from the wall, then the computer is pulling 588W from the PSU. The gaming power consumption will be even lower, peaking at 525-575W.

 

Actually, it will be even lower than that because he will be undervolting both 280Xs.

 

Therefore, again (and hopefully for the last time), his PSU has enough power. Ok? Ok.

 

Thank you.

 

Please do not glaze over the fact that he has an i5-2400 in an H87 board. This means no overclocking. Also, please don't glaze over the fact that he will be undervolting both 280Xs. Ok? His PSU has enough power. Period.


Edited by TwoCables - 3/30/14 at 9:03pm
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post #20 of 22
Thread Starter 
Thanks mate. Nice to know I wont have to upgrade my PSU if I add a second card. (wont be for a while. Only just got the first 280x.) Got a great deal. Couldn't pass it up. +Rep
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