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6870s to 7970s - New PSU? - Page 2

post #11 of 15
Sorry, should have been clearer earlier. You can cancel if you really want.

I stated the conditions under which I thought you should get a new power supply; it's implicit that if those weren't covered (you're not overclocking the cards) then the old power supply would be usable (but not particularly recommended). Again, the power supply is aging and rated for 540W on +12V. For a system similar to yours, you'd hit 540W on +12V before you hit 650W on all rails combined.

To me, "time for an upgrade?" (I would say "yes" generally, though it depends, as stated before) is a different question than "do I really have to upgrade or else?" ("no, not really"), so I answered accordingly.

In the above example from bmgjet, 580W from the wall is about 493W DC output from the power supply (out of 620W) if it's about 85% efficient. There's some room left. Note that FurMark load is different than FurMark + prime95 load. But I wouldn't recommend going regularly to 80% or so while gaming, though that should be fine.

For general computer usage you don't need nearly as much power as when really loading things up, and you can't really increase power consumption all that much over stock without large overvolting.
post #12 of 15
Thread Starter 
Quote:
Originally Posted by mikeaj View Post

Sorry, should have been clearer earlier. You can cancel if you really want.

I stated the conditions under which I thought you should get a new power supply; it's implicit that if those weren't covered (you're not overclocking the cards) then the old power supply would be usable (but not particularly recommended). Again, the power supply is aging and rated for 540W on +12V. For a system similar to yours, you'd hit 540W on +12V before you hit 650W on all rails combined.

To me, "time for an upgrade?" (I would say "yes" generally, though it depends, as stated before) is a different question than "do I really have to upgrade or else?" ("no, not really"), so I answered accordingly.

In the above example from bmgjet, 580W from the wall is about 493W DC output from the power supply (out of 620W) if it's about 85% efficient. There's some room left. Note that FurMark load is different than FurMark + prime95 load. But I wouldn't recommend going regularly to 80% or so while gaming, though that should be fine.

For general computer usage you don't need nearly as much power as when really loading things up, and you can't really increase power consumption all that much over stock without large overvolting.

I think you are in the vote of getting a new card (may not be 100% necessary, but with an aging PSU like mine, it is a good idea to ensure enough power now and in the future). Do you think I should wait for a good sale, or is the sale that you posted one of the better ones you've seen for an 850 watt?

It seems like I could get by for now on a 650 watt, but I should keep an eye open for a good deal. If the deal you posted is a good deal, then I probably will keep it and future proof myself. The fact that it is modular and has so many 8 pin connections is a plus as well.

But if you think there will be better deals in the next month or two, perhaps I should wait.

I don't shop very often for PSUs - so it is tough for me to tell a good deal. So thanks again for all the help.

PS - my current PSU just passed its 5th birthday in various systems (the first system it was in had a GTX 260 and a Q6600.
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I Shoot to Maim
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post #13 of 15
looks like i started something i shouldn't have biggrin.gif

like people said, there is a HUGE difference between whether you SHOULD vs whether it's NECESSARY smile.gif we think you SHOULD upgrade, but i was simply answering the NECESSARY part of your question tongue.gif

capacitors do age over time so running an older PSU towards its limits is not a good idea (at least not at an extended period of time) and you WILL eventually need to upgrade anyway. as far as a good deal, shilka already said, the unit he recommended is already a good deal so it's not really a bad idea in picking it up. if you are REALLY short on $ then sure you can hold off. but as far as holding off for a better deal to come along, that's less of an issue since it's already a good deal considering the quality of the unit in question. high quality PSU will cost a good amount of $. granted there are the occasional 1 day sale that may be alittle better, but generally speaking you gotta keep your eyes pretty open to find deals like that.

if you are REALLY short on $ then sure you can cancel it. but you will eventually need it so might as well if you aren't that tight on $.
post #14 of 15
Being 5 years old then yeah it would be a good idea to replace it when you do some overclocking.
It probably doesnt have 2X 8 pci-e and 2X 6 pci-e power connectors on it so youll have to use molex adapters.
post #15 of 15
Thread Starter 
Quote:
Originally Posted by bmgjet View Post

Being 5 years old then yeah it would be a good idea to replace it when you do some overclocking.
It probably doesnt have 2X 8 pci-e and 2X 6 pci-e power connectors on it so youll have to use molex adapters.

I kept the order. Thanks for all the help guys.
I Shoot to Maim
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Window 10 Qnix 1440p @ 96Hz; Asus 27" 1080p; Acer 24" 1050p Logitech G910 Orion Spark Mechanical EVGA GQ 850 watt 
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