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Is a 650w enough? And other dumb questions. :) - Page 2

post #11 of 22
Thread Starter 
Yeah using the 650w by all means is a short term thing, no more then two months at most. Just wanted to see if it was a viable thing to do.
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post #12 of 22
Thread Starter 
Quote:
Originally Posted by Zackcy View Post
If you didn't buy your parts, wait for Bulldozer .

650w is enough for a 6950, but molex adapters.................don't know. Not very idle for high wattage PSUs.
I am waiting for bulldozer, thats why the motherboard is AM3+
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post #13 of 22
The 650TX is an older but still very well built PSU, HD6950 x2 won't even really stress it at all, will be more than fine.

Even if you unlock both 6950s and OC them past 6970 specs the PSU is more than capable of handling that without trouble.
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post #14 of 22
Quote:
Originally Posted by jagz View Post
My question there is what is taking less power than it says, there? Or does every component actually take a bit less than listed?
Im not sure I completely follow your question.

Edit: I think I understand now. In the Guru3d review that I linked, they measured that a single HD6950 2gb draws 158watts, and two draw 329watts. So the 200watt power draw you are referring to appears to be an inflated number.
Edited by Mattb2e - 5/11/11 at 2:38pm
post #15 of 22
Quote:
Originally Posted by Mattb2e View Post
Im not sure I completely follow your question.

Edit: I think I understand now. In the Guru3d review that I linked, they measured that a single HD6950 2gb draws 158watts, and two draw 329watts. So the 200watt power draw you are referring to appears to be an inflated number.
Yea that's what I meant. Thanks though, Because I had planned on 2 6950's (in time) so good to know.


Edited by jagz - 5/11/11 at 5:07pm
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post #16 of 22
I would not use a 650W for CrossfireX 6950s (assuming overclocking and all, I would use at least 750W-850W; these are top end high TDP GPUs) but for a single one it should be fine
post #17 of 22
If I were you, I would get a good 750watt. A 750 watt continuous power supply will keep you happy for quite a good while unless you decide to SLI 480s or 580s. If you got the money, by all means go for a 850 watt. But either way, do not get the 650 watt unless you are really tight on money - trust me you will end up replacing it.
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post #18 of 22
Quote:
Originally Posted by Zackcy View Post
If you didn't buy your parts, wait for Bulldozer .

650w is enough for a 6950, but molex adapters.................don't know. Not very idle for high wattage PSUs.

Bulldozer results are in 8core amd bulldozer= i7 2600k.

Bulldozer=Fail. I dont get whats with the useless hype.
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post #19 of 22
With that PSU, you're 100% fine. I'm trying to find this video I saw a while ago of this guy running dual 570s in a sandy bridge build with an Antec 500w PSU. No luck yet, but I'll post it here when I find it.

650w is enough for pretty much any dual-card setup, and that's a quality power supply. Power won't be an issue.
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post #20 of 22
Quote:
Originally Posted by 5outh View Post
With that PSU, you're 100% fine. I'm trying to find this video I saw a while ago of this guy running dual 570s in a sandy bridge build with an Antec 500w PSU. No luck yet, but I'll post it here when I find it.

650w is enough for pretty much any dual-card setup, and that's a quality power supply. Power won't be an issue.
+1 to this guy.
This is why it's best to ask these power questions in the power supply subforum, rather than the AMD forum you'll get a much stronger consensus of more correct answers (no offense guys, I wub you too).

I'm going to make one last entreaty in this thread, and then I'll let you make up your own mind between dissenting opinions. As I'm assuming you're unlocking your 6950s and overclocking them to at least 6970 clocks, that makes them essentially 6970s (you'll probably bump them up to 6970 volts).

So this review here measures the maximum wattage of the entire system at 550Watts. Why is maximum important? Because maximum means peak (the highest spike recorded, most of the time usage is lower), the 650TX is rated for 650Watts of continuous output, and can peak well above 650Watts.

So, we've already established that your system would be more than fine, but there's a caveat, that 550Watts they recorded? That's power from the wall. In other words, there is an efficiency loss in a power supply when you convert from AC power to DC, so assuming that their power supply was very efficient @ 85%, that 550W wall draw is actually more like 465W of system draw.
And the PSU is rated for 650Watts of continuous power delivered to the system.

So to sum up, 6970s in crossfire running a heavy load, measured to draw 465Watts, leaving >200 Watts of continuous watt delivery headroom on a quality 650W unit like the tx650.

But it's your call of course.
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