Besides, dual 7950's in Crossfire will be more then ahead of the pack for graphics performance for quite some time, I am not too worried. And if eventually I choose to triple Crossfire, the prices will be a lot cheaper by then.
---------- Post added 2012-02-12 at 09:37 PM ----------
Fair enough. I have a 750 watt Thermaltake Comet but I am going to sell it with my current rig when I upgrade. Odds are I will go for 650 watts just to be on the safe side then with this one:
I know it costs 10 bucks more then the HX650 from Corsair, but I would rather have the silent fan that the SeaSonic has.
http://www.performance-pcs.com/catal...x&cPath=60_236 never actually went through ordering or anything.
i7 930 @ 4.0Ghz | Sapphire HD5970 w/ Accelero Xtreme | ASUS P6X58D Premium | 32GB Kingston DDR3-1600
Xonar Essence STX | 128GB Vertex 4 | AX750 | Xigmatek Elysium
Laing D5 | XSPC RX 360mm | Koolance RP-452X2 | EK-Supreme HF
Dell 3007WFP-HC | Samsung BX2350 | Das Keyboard Model S Ultimate | Razer Naga Molten | Sennheiser HD650
Last edited by Rennadrel; 2012-02-13 at 10:49 AM.
OC'd HD 7900 series ~250W
OC'd Sandy Bridge ~130W
That's already 630W without taking into account the rest of the system, and you really shouldn't be running a PSU at near 100% capacity for endurance and efficiency reasons. If he really plans on getting two high-end video cards, then I would suggest a 750W PSU minimum and more likely find him an 850W like a Seasonic X, Corsair AX, Kingwin Lazer Gold/Platinum, NZXT Hale90, etc. Or honestly because 80 Plus certification doesn't really matter that much, a Corsair TX850-M or NZXT Hale82 are absolutely fine.
Last edited by kidsafe; 2012-02-13 at 03:52 PM.
10% load = 83% efficiency = 75W DC and 90W AC ... 15W power --> heat
20% load = 88% efficiency = 150W DC and 170W AC ... 20W
50% load = 90% efficiency = 375W DC and 417W AC ... 42W
Now a 550W:
13.6% load = 85% efficiency = 75W DC / 88W AC ... 13W power --> heat
27.3% load = 89% efficiency = 150W DC / 168W AC ... 18W
68.2% load = 89% efficiency = 375W DC / 421W AC ... 46W
The difference in heat output is negligible, so that cannot really effect component endurance.
What can effect component endurance though is how many components are in the PSU. A PSU with bigger or more capacitors, transformers, filtering coils, VRMs, etc. puts less stress on each component. A PSU also tends to have its best voltage regulation and ripple suppression at lower loads... Voltage regulation is pretty much the most important factor for ensuring system stability while ripple suppression is important for ensuring the lifespan of those components.
All in all, I want something that is modular, fairly to very efficient and gives me a certain amount of breathing room. Modularity and efficiency have a ballooning effect on the price of PSUs. On Newegg the Seasonic X-560 is $135. A Corsair AX750 is $150. They're both based on the same platform...
Last edited by kidsafe; 2012-02-13 at 05:41 PM.
I'd rather buy the same PSU at 650 for more money than the same at 750 if it fits the build better.
If you are at or close to 50% in load, you will put long term stress on the PSU even though you will achieve less efficiency.
The sweet spot for lasting is between 70-80%.
That's why I recommend them.
Of the two you linked, I'd rather pay 150 for the x-560 than 135 for the ax750 for my current build.
@tetrisGOAT and how would one know if he is using his psu at 50-60 %?
http://www.coolermaster.outervision.com/PSUEngine fill in values. 90% system load (only FurMark CAN make it 100%, and only if it runs a CPU-benchmark at the same time, ie, unlikely).
Select GPUs with equal TDP-value if the ones you're using isn't there.
I fucking hate cable management.
"I'd rather laugh with the sinners than cry with the saints." --Billy Joel
"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down "happy". They told me I didn’t understand the assignment, and I told them they didn’t understand life.” --John Lennon
@Gottie4u amin to that brother but, as i can see you got a pretty nice gaming rig, why dont u invest some $ for a better case ( btw is that a thermaltake v9?).