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Advice please on new PSU for new PCI-E system

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  • PCI Express
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Last response: in Components
April 10, 2007 9:11:53 AM

I'm currently on an old AGP based build, and after looking at my options, and the cost involved in inproving that system on AGP, I am now looking at moving completely over to a new PCI-E based build and supplementing my move by selling my old components.

As you can imagine, this involved a major swap out of components; one of which being my PSU, which isn't up to scratch.

I'm looking at the new build to be primarily a games machine, and it being an Intel / ATI based affair (for no reason apart from an illogical tendency towards them due to good experiences with my current system).

I am currently looking at the ASUS Commando motherboard and some variety of PCI-E X1950 Pro or similar along with a E6300 Core 2 Duo CPU, although some or all of this could change as I investigate them a bit more!

I know next to nothing about PSUs (I've just been reading the guides on this forum, and now understand some of the important features). Can anyone please give me some advice on a good PSU? I'm looking at paying under £100 (in the UK), although would prefer nearer £80.

I saw this one which looked quite good; would this be suitable, or can you suggest an alternative which would be better?

Many thanks!

More about : advice psu pci system

April 10, 2007 2:33:31 PM

Thank you; yes, I did look at that list, but unfortunately (perhaps because they're good!), most of these looked out of stock at places I looked.

The OCZ 600W one looked good for what I wanted; I've found it at £81.50:

Would that be suitable?

(Note that I'm assuming that it says SLI-Ready just because it's got a stamp of approval, not that there's anything in it which would cause problems with an ATI system?)

Thank you!
April 10, 2007 2:57:22 PM

Thank you!
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April 10, 2007 3:54:25 PM

600W OCZ? I just wonder why

I've run 3,0 @ 3,50 GHz prescott rev D (really hot) along with unlocked GF6800, 4 sticks of DDR1, 2 hard drives, 2 optical drives, sb live and some fans on the cheapest 300W PSU for almost a year, until I built a new PC
April 10, 2007 9:57:56 PM

yeah 600w ocz is a bit overkill.
April 10, 2007 11:22:28 PM

I guess that I've been looking to buy myself some time on this new PSU as well as satisfying what I need today. The question is whether the sort of kit I'll be looking to upgrade to in 2 years (for example) would be satisfied with this PSU or whether it'll likely need a 2KW model!
I suspect the latter, so maybe it's not worth investing money now to help myself along in a couple of years; perhaps incorrectly.

What sort of wattage would you say would be needed? I understand that the main things to ensure is the total amps to the +12v rails and that it's a stable PSU, but aren't sure after that.

Putting my new system characteristics into the Power Supply Calculator, I found that it thought I would need 277W for my requirements. Even if I went SLI / Crossfire in the future, I'd need around 344W, so it would seem that a 500 or even 400W would do enough for me; correct?

I like the idea of a modular PSU to reduce the mess in my case.

How about the Enermax 400W? Seems like it would be good enough, and it's only £54 (with P&P):

Or maybe it's worth an extra £11 for the Antec 500W model (price £65 with P&P). It's not a great deal more cash, but would I notice the difference?

Or the same price as the Antec model, there's the Zalman model 460W:

Choices, choices!
April 11, 2007 10:44:13 PM

Thanks mpilchfamily.

I've gone through the 101 and reference lists again, and worked out my requirements.

I think that I need a minimum of just under 25A on the +12v rails, and a minimum of 400W on the PSU. (I'm ignoring my potential to go SLI / Crossfire in the future, as I may as wel cross that bridge when I come to it! I think this upgrade should keep me happy for a year or two!)

Looking at the ones you advise as decent/stable PSUs, I think that the Enermax Liberty 400W 30A model fits the bill the best.
It's relatively low cost (£54 from when you add on P&P), provides 30A and 400W in total.

I'm not overlooking anything which could cause a disaster for me in this choice, am I?
April 11, 2007 10:47:24 PM

Yes it's just a stamp of aproval. But any SLI certified PSU will aso run a CF system.

I don't know about that... my Seasonic S-12 550W w/ 41A is SLI certified but I wouldn't dare fire it up with X1900XTX's in crossfire.
April 12, 2007 8:49:56 AM

Thank you for all of the help and advice - I'm going to go for the Enermax Liberty 400W unless anyone shouts now that it's a bad idea...!
April 18, 2007 12:14:44 PM

I've now decided on what I'm going to buy for my new build (see my posting on the homebuilt board here).

I would value people's opinion from this forum into that thread please, particularly on the subject of the PSU power.

Thank you!