Personal computing discussed
Moderators: renee, SpotTheCat, Nemesis
Nec_V20 wrote:Buying an expensive 80+ Gold 750 or 850 Watt PSU might seem like overkill, however in your system you will always be running it in it's peak efficiency range and will save you quite a bit of money over time compared to a PSU which will be running at over 75% all the time.
Also what happens when you upgrade your system in the future (crossfire for instance)? All of a sudden you need a new PSU and the lower price of the 400 Watt PSU is no longer looking so good.
Flying Fox wrote:Nec_V20 wrote:Buying an expensive 80+ Gold 750 or 850 Watt PSU might seem like overkill, however in your system you will always be running it in it's peak efficiency range and will save you quite a bit of money over time compared to a PSU which will be running at over 75% all the time.
Also what happens when you upgrade your system in the future (crossfire for instance)? All of a sudden you need a new PSU and the lower price of the 400 Watt PSU is no longer looking so good.
Peak efficiency range is around 50-80%. I don't see how a system pulling 200-250W is at that range if you put a 850W PSU.
Nec_V20 wrote:Buying an expensive 80+ Gold 750 or 850 Watt PSU might seem like overkill, however in your system you will always be running it in it's peak efficiency range and will save you quite a bit of money over time compared to a PSU which will be running at over 75% all the time.
Also what happens when you upgrade your system in the future (crossfire for instance)? All of a sudden you need a new PSU and the lower price of the 400 Watt PSU is no longer looking so good.
Voldenuit wrote:Power drop for a typical PSU is ~15-20% over 5-7 years, and that's a worst case scenario. The 400CX is a well built 'value' PSU that will happily chug along for years.
On top of that, the '250W' power draw measured in the 7870 review is at the wall. PSUs are rated for 'output' power, which in this case would be 200W from the PSU. A 400W PSU is *plenty*, even with a 20% peak power drop over 7 years.
Voldenuit wrote:Nec_V20 wrote:Buying an expensive 80+ Gold 750 or 850 Watt PSU might seem like overkill, however in your system you will always be running it in it's peak efficiency range and will save you quite a bit of money over time compared to a PSU which will be running at over 75% all the time.
Also what happens when you upgrade your system in the future (crossfire for instance)? All of a sudden you need a new PSU and the lower price of the 400 Watt PSU is no longer looking so good.
Wait, so you're advocating the OP spend money now to buy a more powerful PSU so he can run it futher from its peak efficiency at both load and idle on the off chance that he buys a second card to crossfire on a motherboard that isn't ideal for crossfire (PCIE x16/4)? At an average electricity price of 12c/kwHr, it would take over 5 years to make up the price of an $80 PSU if he were to save 15W from efficiency with the new PSU (a very generous estimate), and that's if he were running his computer 24/7.
Somebody give that man a gold star!
To the OP: your existing PSU is fine for the 7870, no need to upgrade the PSU.
Nec_V20 wrote:Voldenuit wrote:Wait, so you're advocating the OP spend money now to buy a more powerful PSU so he can run it futher from its peak efficiency at both load and idle on the off chance that he buys a second card to crossfire on a motherboard that isn't ideal for crossfire (PCIE x16/4)? At an average electricity price of 12c/kwHr, it would take over 5 years to make up the price of an $80 PSU if he were to save 15W from efficiency with the new PSU (a very generous estimate), and that's if he were running his computer 24/7.
Somebody give that man a gold star!
To the OP: your existing PSU is fine for the 7870, no need to upgrade the PSU.
You did not look at WolfOx's spec in his original post, something which I took into account when I wrote my post on this thread.
You're assuming things I did and didn't do on your end.
I did read the OP's specs, otherwise, I could not have known his motherboard PCIE lane configuration or his PSU make and model.
Wait, so you're advocating the OP spend money now to buy a more powerful PSU so he can run it futher from its peak efficiency at both load and idle on the off chance that he buys a second card to crossfire on a motherboard that isn't ideal for crossfire (PCIE x16/4)?
Nec_V20 wrote:You jumped into this thread not with any advice for the original poster but rather to try to stomp on someone you perceive as a newbie, and therefore weak because he has not been on this forum very long, for no other reason I can divine other than as an attempt to intimidate.
Nec_V20 wrote:His system is reaching obsolescence and he will obviously be rebuilding it completely sometime in the near future; and when you start going down that route you start adding things on.
Voldenuit wrote:Nec_V20 wrote:You jumped into this thread not with any advice for the original poster but rather to try to stomp on someone you perceive as a newbie, and therefore weak because he has not been on this forum very long, for no other reason I can divine other than as an attempt to intimidate.
Wow, so you now not only claim to know what I did, you now know my motivations as well?
I joined this thread to correct what I saw as poor advice and and poorly reasoned justifications. You yourself said that your last few PSUs were blown while the UPS was disconnected, yet somehow jump to the conclusion that the fault lay with the PSUs and that the solution would be to buy a more expensive one.
In addition, you repeatedly make assertions about people's motivations and intentions instead of questioning them (with both the OP and myself). Do you know that the OP wants to upgrade the rest of his system? No, you just assumed (you may very well be correct, but you didn't bother to ask).
Telling someone to buy a good PSU is good advice. Telling someone they need to buy a new PSU when they don't, isn't.
Buying an expensive 80+ Gold 750 or 850 Watt PSU might seem like overkill, however in your system you will always be running it in it's peak efficiency range and will save you quite a bit of money over time compared to a PSU which will be running at over 75% all the time.
Also what happens when you upgrade your system in the future (crossfire for instance)? All of a sudden you need a new PSU and the lower price of the 400 Watt PSU is no longer looking so good.
GeForce6200 wrote:I'm sure OP knows but that CX400 will be fine. I've had a Corsair literally blow up on me and there was no system damage. Heck they even bumped me up a model. Strong Seasonic built unit. An old review by Hardware Secrets shows the units efficiency at different load levels.Nec_V20 wrote:His system is reaching obsolescence and he will obviously be rebuilding it completely sometime in the near future; and when you start going down that route you start adding things on.
Jumping to a bit of a conclusion there.
If the person considers his HD 5770 to be inadequate and in need of replacement then it is not a large stretch of the imagination to postulate that the person might look upon the rest of his system with an eye to replacing it. Although my own system is based on a Core i7 990x I still have the XFX HD 5770 I originally built into it as a placeholder three years ago and I am pleasantly surprised how well it has held up (I assumed I would have to replace it at the time and was waiting for the prices for the more performant graphic cards to come down). So when I read that person's specs I was pretty sure that a 7870 was not going to give him the performance boost he obviously promises himself.
Nec_V20 wrote:At the start of the thread the original poster brought up the subject of getting a new PSU and I was addressing this eventuality. Where in that reply am I telling the person that he has to buy a new one? ...
I was voicing my opinion that if he did need to buy a new PSU because his old one was not up to the job, then just moving up a small notch might be saving at the wrong end.
Voldenuit wrote:Nec_V20 wrote:FIGHT!Voldenuit wrote:More stuffStuff.
Chrispy_ wrote:
Guys, quit frightening new forum users with massively complex and almost offtopic arguments.
Is a 400W Corsair CMPSU-400CXUK/400CX enough for an HD7870?
Yes.
/end thread.
cynan wrote:As long as it's not an HD 7870 with a Tahiti LE chip...