Recently purchased 6850's, is PSU good enough?

[techmaniac]

I purchased all pair of 6850's and THEN remembered to check my PSU against the specs. Looking into this post:
http://www.tomshardware.com/forum/304367-33-power-supply-crossfire-6850s

I see that technically I should have enough juices for 2 6850s on this psu:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139004

but I suck at math and electricals.

More importantly, do I risk any damage to the system by attempting to plug in the second card on that power supply?

 

[wasupmike]

for 2 x R6850's: recommendation is at least a 600W PSU... although because that Corsair is a top quality PSU... good chance it will handle them...

although if you plan on overclocking... and want to be on the safer side.. you might wanna go with this instead:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005

 

[purple stain]

Yes you will have plenty of power for both 6850's and more.

Total system draw with x2 6870's is 280watts so you will be fine.

And the reccomendation that they list is just a precation not the actual power draw.

 

[techmaniac]

Does it matter what other components too at that wattage?

So the entire build for your consumption is :

CPU: Q9550 (no OC.. yet. There's a separate question there.)
3 HDDS (2 in raid)
burner/DVD drive
3 fans yada yada

You are still confident that that's not going to all go boom when the second card is shoved in?

 

[jjb8675309]

I would say you will be fine, that is a high quality psu and your system load shouldnt approach the total wattage under a full load unless of course you start ocing like crazy but overall you should be fine.

 

[purple stain]

^agree

Total system draw of x2 6870's was with a test machine,an O.C. i7 with 1 CD drive and 1 Harddrive and it didn't cross over 300watts.You should be fine even with an O.C.

I know you are getting a 6850 but i used the 6870's as a reference because they consume more power than the 6850.

 

[jjb8675309]

^agree

Total system draw of x2 6870's was with a test machine,an O.C. i7 with 1 CD drive and 1 Harddrive and it didn't cross over 300watts.You should be fine even with an O.C.

I know you are getting a 6850 but i used the 6870's as a reference because they consume more power than the 6850.

the op will be fine

I plan on running a quad core amd system and 6870 crossfire with 4gigs ram, 1 hdd, 1 optical, 6 120mm fans with this psu:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207002

which should be more than enough but you will still find yourself well below the envelope yourself, and the corsair is a quality make, my psu although it is xfx is said to be made by seasonic which is another excellent psu company.

 

[jjb8675309]

I think that it is pretty awesome that you no longer need an overkill PSU for excellent crossfire performance as long as you go with a good name and ample enough specs to get the job done at full load. Buy a crappy 620w apevia/coolmax/radimax etc. and there is really no telling what the efficiency is a 600w psu could only be pulling 400 for that matter. 80 plus bronze is a pretty decent endorsement

 

[techmaniac]

Best answer selected by techmaniac.

 

[techmaniac]

I think that it is pretty awesome that you no longer need an overkill PSU for excellent crossfire performance as long as you go with a good name and ample enough specs to get the job done at full load. Buy a crappy 620w apevia/coolmax/radimax etc. and there is really no telling what the efficiency is a 600w psu could only be pulling 400 for that matter.

Yeah, I'm pleased with the purchase of even ONE 6850. It's the Toxic version, and doesn't really too much of an OC at 820, but I've seen articles that took it to 850 without voltage changes. I'm sure with two at that speed though, I'm not in any danger of running out of FPS. I may overclock if there appears to be a bottleneck because of the CPU.

 

[jjb8675309]

Yeah, I'm pleased with the purchase of even ONE 6850. It's the Toxic version, and doesn't really too much of an OC at 820, but I've seen articles that took it to 850 without voltage changes. I'm sure with two at that speed though, I'm not in any danger of running out of FPS. I may overclock if there appears to be a bottleneck because of the CPU.

yeah I am currently running One 6870 and am very pleased with it...
crossfire 6800s is one of the best bang for your buck solutions imo.