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750W or 860W

Akla

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#1
Hi guys,
I'm new and i have this question torturing me, I never know the wattage of the psu i should buy, I'm upgrading my rig and it is composed like this:
Gigabyte GA-FXA990-UD7
8GB Corsair Dominator @1600Mhz
Phenom II 955 BE 3.2Mhz (I will try to reach 4.0 or 4.2)
Corsair H110 Push/Pull
EVGA GTX760 SC ACX
1SSD and 1HDD

I'm considering a Seasonic P-760 or a Seasonic P-860.
What should I buy? All thoughts are welcome.
Thank you in advance and sorry for my english.
 
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#2
Both are very good, and P-860 is an overkill for this configuration - even the P-760 is an overkill for that. That system would keep 650W PSU at optimum efficiency at 100% GPU and CPU load with overclocking headroom. 650W would be the sweet spot, but if you are planning to SLI that GTX 760 later and OC everything, go for Seasonic P-860.
 

Akla

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#3
Thanks I'm planning to change the CPU when the new AMDs AM3+ will have 16cores, that should not be far away to be announced. I forgot to mention this.....my bad
 
Joined
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Messages
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Location
Zagreb, Croatia
System Name Windows 7 64-bit Core i5 3570K
Processor Intel Core i5 3570K @ 4.2 GHz, 1.26 V
Motherboard Gigabyte GA-Z77MX-D3H
Cooling Scythe Katana 4
Memory 4 x 4 GB G-Skill Sniper DDR3 @ 1600 MHz
Video Card(s) Gainward NVIDIA GeForce GTX 970 Phantom
Storage Western Digital Caviar Blue 1 TB, Seagate Baracuda 1 TB
Display(s) Dell P2414H
Case CoolerMaster Silencio 550
Audio Device(s) VIA HD Audio
Power Supply Corsair TX v2 650W
Mouse Steelseries Sensei
Keyboard CM Storm Quickfire Pro, Cherry MX Reds
Software MS Windows 7 Enterprise 64-bit SP1
#4
One thing to consider is fan speed on the PSU. If you take 800W PSU, fan would barely speed up on full load. On 400W PSU, same system would also work at full load, only PSU fan would be much more audible.
 
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#5
Unless you're planning on SLI or a considerably more powerful GPU down the road, a decent 500w PSU would be plenty adequate for that rig.
 
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#6
Agreed, 450-550W would be plenty, even with overclocking...
Where are you buying from?
 
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#7
The lower wattage one will be plenty.