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Hiper 4S525 PSU OK for a HD7950 or 660Ti??

post #1 of 22
Thread Starter 
Hi all.

I am looking to upgrade GFX card to either an HD7950 or a GTX660Ti.

My PSU is quite old (~7 years) but was decent spec (albeit OEM) at the time I got my PC (which has had several upgrades since).

It is a Hiper HPU 4S-525, 525W PSU. It has two 12V rails, one rated at 20A, one at 17A. As per image below, the label says max combined wattage on the 12V rails of 360W. Which is 30A, right?

I thought this should be enough for a 660ti or a 7950. However, discussion on another forum has lead me to question this. I think it has enough overall wattage, but is this amperage on the 12V rails enough? Opinion from this other forum was that it was right on the limit, and that I should upgrade to a modern PSU with more amps on the 12V rail.

The power calculator on this forum says I should only need a 400W PSU for my rig with a HD7950 or a GTX660Ti... seems very low? I used the online eXtreme Power Supply Calculator Lite and it recommends 500W. Someone on the other forum used the pro version of that calculator and I think that said that I need 30A on the 12V rail.

I am running an Intel i5 Lynnfield, 4 sticks of DDR3 RAM, about 6 SATA drives, 2 optical drives, a USB SATA dock and a Logitech G25 USB steering wheel (don't think the wheel is relevant?!)

Currently an nVidia 8800GT GFX card, hence the need to upgrade that! biggrin.gif

What are the thoughts of the experts here? Clearly I don't want to pay out for a new PSU unnecessarily, but I don't want to have an unstable system with my shiny new GFX card either...

Thanks in advance!


Edited by glastolover - 3/1/13 at 1:40pm
post #2 of 22
Your rig only has 360w available for the 12v rails, which isn't quite enough for a modern setup. Hardly anything uses the 3.3v / 5v rails anymore, so I'd treat your PSU as if it were truly a 360w model. I hate to advise other people to spend money when they don't want to, but it's really time for a new PSU.

Considering your setup and wish to keep costs low, I'd recommend a new PSU in the 450-500w range. Current-era models can deliver essentially all its rated wattage to the 12v rail(s), so that would suffice for your rig.

A Corsair CX500 would be the budget-oriented choice, but you could step up to a higher-quality Seasonic G Series SSR-450RM, or a Rosewill Capstone-450.
Edited by svenge - 3/1/13 at 7:05pm
Julia
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Julia
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post #3 of 22
Thread Starter 
Thanks a lot for the quick reply, sounds pretty much like you agree with the diagnosis I have had, good to have it confirmed!

Have been looking at replacement options. I was thinking that while I could get away with 550W or 500W (not sure about 450W really?!) I should look to get 650W to be future proofed and get something that will not be running too loaded so will be running more efficiently.

Here in the UK, the best quality/price combination I came up with was a Corsair TX650 V2 for £66.

I want to get a high quality PSU, and as the Corsair TX range is not their entry level, it is pitched at the "enthusiast", generally gets pretty good reviews, I am thinking this would be a good buy.

My only slight concern is that I read quite a few comments that it is a little bit noisy. To be honest, my old PSU is pretty noisy, so it probably wouldn't be any worse, most likely a bit better even, but if possible I would like to get something that will be nice and quiet. It isn't modular either, which would be a nice to have.

However as you recognised, I really don't want to spend much more than this!!

Other advice I had was to go Seasonic like you said. Here the 650W G series is ~£90.

I am thinking it is worth going for the higher power - the 450W Seasonic G Series is about £70 here, so for £20 you are getting quite a lot more.

Do you really think 450W would be enough?

Any other thoughs/recommendations gratefully received!
post #4 of 22
That is an old CWT DSA unit, if it wasn't abused (temperature wise) it should be perfectly capable of handling a 660Ti (a 7950 not so much, it's much more demanding than a 660Ti). But if I were you, and budget constrained... I'd get a 7870 XT (Tahiti LE, a sort of undercover 7950, excellent performer and excellent value for money) and use the money difference to get a new PSU (a high end 400-450W would be my pick).
Edited by Original Sin - 3/2/13 at 2:31am
post #5 of 22
Thread Starter 
I have considered the Tahiti LE, but here in the UK it does not seem to be so cheap. You can get a PNY 660ti for £197 vs. £188 for the Tahitie LE.

Also the LE sounds like it does consume quite a bit of power?

A good (Gigabyte Windforce) 7950 is £240 here.

Ideally I would get that 7950 and the Seasonic 650W. That would be £320 (including the Never Settle Reloaded games - Bioshock Infinite and Crysis 3) which is not a bad deal.

I kind of am and am not budget constrained - could spend that much, but don't really want to!!

If I could get very similar performance from a cheaper PSU and teh 660ti (which I probably would, even perhaps better with regards to techreport's alleged frame latency issues on the 7950!), then I feel perhaps I should.

Interesting that you think my PSU might be OK with the 660Ti. It is 7 years old, but I don't think it has been abused?! is it worth getting the PNY card and trying it? What would the risk of damaging anything be if it doesn't work, or would I just get random shutdowns?

Thanks for the advice!
post #6 of 22
I would get a 7870 XT over a 660Ti, and a solid, cheap PSU (a beQuiet! L8 430W @ < 50£, or maybe an InWin GreenMe 550W).
post #7 of 22
Thread Starter 
Would a 430W PSU really be enough for a 7870 XT? I think it would be a bit close, no?!
post #8 of 22
Plenty. smile.gif
post #9 of 22
Thread Starter 
Quote:
Originally Posted by Original Sin View Post

Plenty. smile.gif

Not saying you're wrong, but I find that odd. If my current PSU, which is effectively 360W on the 12V rail is not enough for a 7950, surely a 7870 LE (which draws more juice, right?) will be tight on a 430W PSU??
post #10 of 22
Quote:
Originally Posted by glastolover View Post

Not saying you're wrong, but I find that odd. If my current PSU, which is effectively 360W on the 12V rail is not enough for a 7950, surely a 7870 LE (which draws more juice, right?) will be tight on a 430W PSU??
Why would a 7870 XT require more power than a 7950?

I think you're misunderstanding my posts. A 7 year old, <400W, poor (by current standards) unit, is not to be avoided because it's "insufficient" for a 7950... it's to be avoided because I wouldn't want that unit unit abused/stressed in any way, nasty things can happen. And then there is the issue of cap degradation (which with old, inefficient units such as the above listed Hiper, is a serious concern).
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