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Hiper 4S525 PSU OK for a HD7950 or 660Ti?? - Page 2

post #11 of 22
Thread Starter 
OK, see where your coming from with that. So you are saying that my old PSU may well be fine, but at 7 years old both its out of date design and state of componentry probably means it is a wise time to upgrade.

Have looked at that Be Quiet brand you mentioned, and they look pretty good.

I could get their 530W modular PSU for about £65 - http://www.ebuyer.com/283835-be-quie...edium=products

Ticks all the boxes of the original Corsair I was looking at for the same price plus is modular and supposedly very quiet.

Only worse thing is comparison is the lower power rating, but you are saying this will be more than enough from my needs, right?

In fact, you are saying that I could go down to their 430W unit.

Interesting... I like the look of those PSUs...

Thanks a lot for your input!
post #12 of 22
At 65 pounds there are better choice available than the L8 530 (lower output, higher quality units), however at below 50 pounds, the L8 430 is an excellent choice (especially if modualrity and silence are important), and plenty for your upgraded setup.
post #13 of 22
Thread Starter 
Quote:
Originally Posted by Original Sin View Post

At 65 pounds there are better choice available than the L8 530 (lower output, higher quality units), however at below 50 pounds, the L8 430 is an excellent choice (especially if modualrity and silence are important), and plenty for your upgraded setup.

To be honest, I am not wanting to go below 530W. I want to have headroom to overclock my CPU, and the PSU calculators I have used suggest 500W to 550W is where I should be.

Given this, do you think there are any better options at around that price for ~530W units?

Thanks for all the advice.
post #14 of 22
I'm not sure you get what you're being told. I don't really care what PSU calculators say, they range from "utter trash" to "crap"... with one notable exception, the one stickied on the top of this forum section, which is still a far cry from what a knowledgeable individual can tell you about power draw/requirements of a given system.

Given that, I believe you should pick w/e you want (since I won't be repeating myself for the 5th time).


You're welcome.
post #15 of 22
Listen to O Sin, he knows what he is talking about. I`m using a Capstone 450 with a 3770K and a 7970 both slightly overclocked and still have a lot of headroom, quality makes a difference and gives you piece of mind. thumb.gif
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post #16 of 22
Noooooooooooooooo.....

Too old, capacitors would have degraded horribly by now.
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post #17 of 22
Thread Starter 
Quote:
Originally Posted by Original Sin View Post

I'm not sure you get what you're being told. I don't really care what PSU calculators say, they range from "utter trash" to "crap"... with one notable exception, the one stickied on the top of this forum section, which is still a far cry from what a knowledgeable individual can tell you about power draw/requirements of a given system.

Given that, I believe you should pick w/e you want (since I won't be repeating myself for the 5th time).


You're welcome.

Steady on!!!

I am sorry if I have offended you, I assure you it was not my intention. I have tried to be very polite and grateful for advice in all my posts.

As a self confessed "non-expert", I am getting advice from a couple of different sources to try to understand this stuff.

You had not explained in your posts before that you thought PSU calculators were all worthless, so I didn't know that. As I said before, the other PSU calculator I used suggested I needed at least 500W, closer to 550W with overclocking. I appreciate that the one on this forum says I only need 400W, but to be fair the inputs to that calculator are not as extensive as the other one I used - for example it doesn't allow you to set any overclock on your CPU. I thought (I may be wrong, as I say, I am no expert) that overclocking CPU was likely to up power requirements by a fair amount, maybe in the order of 50W. I didn't want to get a 430W PSU and then find it ran my system OK, but did not allow me to overclock in the future. That is why I was thinking that I should pay the extra money and get a PSU of at least 530W, albeit still a good quality one.

Also the advice I have read elsewhere all seems to say it is better to have significantly more power than needed so the PSU runs at relatively low load and so high efficiency.

Just trying to explain why I thought I should go for more than the 430W you recommended. As I say, you may well be right and this may be the best solution for me, that is what I am trying to work out! Please realise that I am just trying to figure this complicated subject out and there is a lot of advice out there, not all of it consistent, and I don't know which sources are the best!

I do appreciate your advice (your pointer on looking at Be Quiet PSUs is one I had not had before, and I am thinking that is what I am going to go for) as I said before, thanks again, and sorry to have annoyed you.
post #18 of 22
smile.gif

To break it down:
i5 Lynnfield < 100W
HD 7950 ~ 220W
the rest fits in a 30-40W power envelope.

^Those are full load values, typical load is Much lower. So the issue of efficiency is misunderstood here, having your peak system load at ~50% PSU load is counterproductive and pretty inefficient, given the brief intervals in which your system actually draws that kind of power. wink.gif

To sum it up, the correct way of buying is PSU is exactly the opposite one, you don't go for as much power as you can buy, independent of system requirements and PSU quality/performance... you correctly assess your power requirements and buy the highest quality unit you can afford at (or slightly above, depending on what's available, deals/discounts, etc) that output level.
post #19 of 22
Thread Starter 
OK, thanks for the explanation, it is much appreciated.

Does that full load number you suggest for the CPU include the effect of a nice beefy overclock?

For future proofing, would I be right to assume that any CPU upgrade is unlikely to push CPU requirements above 100W full load? I think CPU trend is for less power usage?

I do have quite a number (currently 4, might want to increase) of internal SATA drives, does that definitely fit into the 30-40W amount for "the rest" that you suggest? From other (discredited!? biggrin.gif) power calculators, I thought SATA drives drew quite a bit of power, perhaps this not the case?

Would I be right to think that the 660ti is similar in full load power draw to the HD7950 (I have still not decided which to go for!)?

Understand your comment about the correct way to spec a PSU, what is your recommendation for setting optimum power rating? Would it be your full load power demand plus 10% or 20% or something or some other approach?

Thanks again, appreciate you taking the time to help me out. thumb.gif
post #20 of 22
Quote:
Originally Posted by glastolover View Post

OK, thanks for the explanation, it is much appreciated.

Does that full load number you suggest for the CPU include the effect of a nice beefy overclock?
Nope, but it's marginal on your particular CPU.
Quote:
Originally Posted by glastolover View Post

For future proofing, would I be right to assume that any CPU upgrade is unlikely to push CPU requirements above 100W full load? I think CPU trend is for less power usage?
You are correct. However there are recent platforms such as the X79 (SB-E) from Intel that remain very demanding power wise (though the mainstream and upper mainstream segments are moving down quite rapidly.
Quote:
Originally Posted by glastolover View Post

I do have quite a number (currently 4, might want to increase) of internal SATA drives, does that definitely fit into the 30-40W amount for "the rest" that you suggest? From other (discredited!? biggrin.gif) power calculators, I thought SATA drives drew quite a bit of power, perhaps this not the case?
Nothing to be concerned about, unless you amass a high number of mechanical drives which generate high loads at start up, and can cause issues with improper PSUs, not your case though.
Quote:
Originally Posted by glastolover View Post

Would I be right to think that the 660ti is similar in full load power draw to the HD7950 (I have still not decided which to go for!)?
Nope, there's a consistent difference between them, at stock the difference is 50-70W (depending on the chip samples) and will rise will overclocks (especially since the Tahiti chip is a proper overclocker, unlike the 660Ti).
Quote:
Originally Posted by glastolover View Post

Understand your comment about the correct way to spec a PSU, what is your recommendation for setting optimum power rating? Would it be your full load power demand plus 10% or 20% or something or some other approach?
Ideally you would want your peak load values to reach ~80% of your PSU's power rating, and idle values somewhere around 20% of its rating (but that's tougher these days, with all the power saving features, many systems sip power at idle).
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