Power Supply

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Klipdrif

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Hi myBB smart people

Please recommend me a power supply. I want to crossfire two asus HD 6870's and run a overclocked i5 2500k.
Im looking at either a 750w or 650w. Im thinking antec or corsair. I hear good things of the Antec HCG.

Which is best between corsair tx v2 and antec HCG or is there a better option?

Are there any specials somewhere on a psu's thats worth a look?

Thanks
 
Klipdrif said:
Hi myBB smart people

Please recommend me a power supply. I want to crossfire two asus HD 6870's and run a overclocked i5 2500k.
Im looking at either a 750w or 650w. Im thinking antec or corsair. I hear good things of the Antec HCG.

Which is best between corsair tx v2 and antec HCG or is there a better option?

Are there any specials somewhere on a psu's thats worth a look?

Thanks
Click to expand...

I'd take the Corsair.
 
I bought a Corsair TX650v2 two weeks ago. Fan was on full blast all the time, which is not very loud, but not acceptable having just spent R1k5 on a Antec P183 to get my pc more quiet and then to find the new R1k1 PSU made it as load as before. Anyway, three days later I traded it on an AX650, a world of difference. I would try to go for an Antec Truepower 650 (was my original choice, but no one had stock) or TP750.
 
Most of the 650W PSU's doesn't have enough graphics card connectors to run SLI/CrossFire.

I'd say either Corsair TX750v2 or Antec HCG 750. I'm slightly more in favour of the Corsair one which has a single +12V rail design.
Your PC would probably draw 500W max, which would still be rather quiet with the TX750v2.

I think the graphics cards would make much more of a noise than the PSU.

@P924:
What are you running on your AX650?
 
I've got a Corsair TX750 and I can't even hear it run.... it also runs cool.... definitely worth every cent.
 
Pada said:
@froot:
What graphics card(s) are you running from it?
Click to expand...

My pc as below (plus a bunch of drives) and a GTX460OC.
At load my computer draws about 450-500W (at stock CPU levels).
 
450 - 500watts seems high for an 80+ PSU and those specs. I'd say around 300 - 350 tops? Would make sense why the TX750 is virtually noiseless, running at low capacity and fan speed. I bet the noise graphs correlate.
 
Last edited:
From
750txv2-noise.gif
I would have to agree.... up to whatever level it's been used, I've never heard my power supply (even from 30cm away).
I had a review that tested the noise levels but I can't find it now.
 
froot said:
From
750txv2-noise.gif
I would have to agree.... up to whatever level it's been used, I've never heard my power supply (even from 30cm away).
I had a review that tested the noise levels but I can't find it now.
Click to expand...

Just don't believe the chart of the TX650v2, google if you don't believe me. But from what I've read the TX750v2 does in fact work like the chart says.

@Pada, I have a i750 with a 6850 on the AX (and the usuals), but I'm planning on getting another 6850 in the future (although, looking at Kepler's spec, that might change...).

A nice thing about the AX650 is it has 4x8pin PCIe power connectors. (I believe the 6870 only uses one each, though)
 
The TX750 (not sure about the 650) also has 4x 8ping PCIe connectors. Pretty awesome I must say. Not that I need them :p
 
I must say, if you are willing to buy without warranty, the Antec TP650/750 is really well priced from esquire (although I think they do not have stock of the 650).

froot, I see you have the TX750M, which is not the same as the TX750v2... The V2 is a Seasonic and the M is a CWM IIRC (or was it a Delta, not 100% sure now).
 
P924 said:
I must say, if you are willing to buy without warranty, the Antec TP650/750 is really well priced from esquire (although I think they do not have stock of the 650).

froot, I see you have the TX750M, which is not the same as the TX750v2... The V2 is a Seasonic and the M is a CWM IIRC (or was it a Delta, not 100% sure now).
Click to expand...

Sorry, my bad.
Yes V2 is made by Seasonic and they wouldn't produce a modular version, so Corsair got CWT to do it.
 
P924 said:
I must say, if you are willing to buy without warranty, the Antec TP650/750 is really well priced from esquire (although I think they do not have stock of the 650).

froot, I see you have the TX750M, which is not the same as the TX750v2... The V2 is a Seasonic and the M is a CWM IIRC (or was it a Delta, not 100% sure now).
Click to expand...

Dunno man, not a fan of those quad rails. +- 20A per rail? I don't think they'll be good for decent dual gfx setups.
 
PostmanPot said:
Dunno man, not a fan of those quad rails. +- 20A per rail? I don't think they'll be good for decent dual gfx setups.
Click to expand...

+1 @ multi rails..... single rail is much better and quad rails make no sense, especially if you go look at them at circuitry level.
 
froot said:
+1 @ multi rails..... single rail is much better and quad rails make no sense, especially if you go look at them at circuitry level.
Click to expand...


Multi-rail is safer if used correctly... basically the same as single rail, but split up with each line its own OCP, how is that worse than single rail? Off course, with single rail you can easily melt some wires if you do it wrong...
 
P924 said:
Multi-rail is safer if used correctly... basically the same as single rail, but split up with each line its own OCP, how is that worse than single rail? Off course, with single rail you can easily melt some wires if you do it wrong...
Click to expand...

Single rail is better. With multi rail PSus it's easy to pull too many amps through one rail, yet the PSU should be able to take it according to the amps on the box. Then you get funny issues.

**** like that doesn't happen with a single rail PSU. It's just better.
 
Qwikslver said:
Single rail is better. With multi rail PSus it's easy to pull too many amps through one rail, yet the PSU should be able to take it according to the amps on the box. Then you get funny issues.
Click to expand...

Which is why I said if used correctly. (that is probably too much to expect from the average PC-assembler) :)
 
PostmanPot said:
Wasn't this more of a truism in the past?
Click to expand...

I believe in the beginning, they split up the 12V rail, so each output will be limited at the current the wires could safely handle. Then due to the reasons quicksilver mentions, most companies changed that to single rail.

The thing is, now you can pull 50A on a single wire, without OCP kicking in, which will result in some molten wires and more chaos.

I think they figured a situation like that is unlikely and no component should draw so much power on a single line (basically shifting responsibility to the GPU).

Either way, as long as you connect everything up correctly, there should be no issues regardless of whether you have a single or multi-rail PSU.

I can just say that if you can push the budget for an AX, do it. It is one of the few components that you keep through a couple of upgrade cycles.
 
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