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Second 8800GTX but is PSU Enough

Voltage

Voltage

Voltage

Soldato
Joined
5 Jul 2006
Posts
3,647
im considering buying a second gtx as oblivion runs like a dog for me at my chosen resolution of 1920x1200.

The rest of my system will be:-

Q6600
2x2gig Corsair XMS
680i mobo
150gig Raptor
X-FI Xtreme Gamer
18 DVDRW
Enermax 670w ATX 2.2

Now im worried about my PSU, and if it would be up to the task to power what will be a heavilly overclocked H20 cooled monster?
 
Corsair HX620 would run 2x GTX's and a quad at stock perfectly fine, overclocked however I don't know.

Raikiri said:
I would consider the 850w Antec just to be safe.
Click to expand...
I would also recommend the Antec Quattro 850w.
 
An 850W PSU will not be enough if you're watercooling aswell. Think of the extra power being consumed. It's not worth buy a new unit and finding out it isn't up to scratch. If you're overclocking you will need the safety net of extra watts.
 
Chimerical said:
An 850W PSU will not be enough if you're watercooling aswell. Think of the extra power being consumed. It's not worth buy a new unit and finding out it isn't up to scratch
Click to expand...

What extra, 18W for a pump? Or hypothetical extra clocks achieved?

A good 850W is more than enough and some. The Quattro mentioned supplies 64A@12v combined. That's plenty for an overclocked quad SLi system. To give a rough idea, a 3.6GHz Quad uses around 185W/16A, an overclocked GTX around 170W/14A.
 
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Confusion said:
im considering buying a second gtx as oblivion runs like a dog for me at my chosen resolution of 1920x1200.

The rest of my system will be:-

Q6600
2x2gig Corsair XMS
680i mobo
150gig Raptor
X-FI Xtreme Gamer
18 DVDRW
Enermax 670w ATX 2.2

Now im worried about my PSU, and if it would be up to the task to power what will be a heavilly overclocked H20 cooled monster?
Click to expand...

I'm suprised Oblivion runs badly with that spec,I have a similar setup albeit on a P35 board,my quad is @3.5 and the GTX clocked to 630/2000,also running at 1920x1200.

Oblivion runs superbly and thats including many of the graphic/texture enhancements,Qarls Texture pack 2 being the most resource hungry of them,the game is still very playable though.

Some settings I have slightly reduced,such as shadow quality/no grass shadows and no self shadows,specular lighting distance also slightly reduced as are a couple of others which currently escape me.

Running 4xaa and 8xHQ AF,framerate dips at times but still much faster than my previous X1900XT crossfire setup.

TBH if you're not overclocking then your current(excuse the pun)PSU should be o.k,otherwise I'd highly recommend one of these http://www.overclockers.co.uk/showproduct.php?prodid=CA-001-PP&groupid=701&catid=123&subcat=928
 
I would have thought the Enermax would be plenty.

I belive the Corsair 620 was running a Quad, Watter Cooled, SLI System and it was overclocked.
 
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Chimerical said:
An 850W PSU will not be enough if you're watercooling aswell. Think of the extra power being consumed. It's not worth buy a new unit and finding out it isn't up to scratch. If you're overclocking you will need the safety net of extra watts.
Click to expand...

I have two pumps going into a system, they only use 6w each... and overclocking wise water wouldn't go much higher than very good air really.
 
I think that there's more guff than gumption spouted here about extravagant PSU requirements of graphics cards here. I would have no hesitation in using a 670W Enermax with your proposed upgrade.

High wattage PSUs are the current fad in the playground.
 
I'm really sorry for hijacking this thread but it's along the same lines as in the OP.

My m8 has an E6600 @3.4Ghz, his Dominator (2x 1gb) is at what knows but it's stable and BFG GTX's in SLi (one BFG OC and one BFG OC2). This is running from an OCZ 700Watt GameXStream PSU http://www.overclockers.co.uk/showproduct.php?prodid=CA-019-OC&groupid=701&catid=123&subcat=148.

He was playing Oblivion the other night for the first time and his whole PC shut off completely. He's been playing Bioshock and Colin Mcrae's DiRT at 1920x1440 or whatever the top resolution is on the BenQ FP241W with no problems at all. Oh and he's just about completed the new MOH Airborne and still no problems.

Do any of you think he should upgrade to the Corsair HX 620watt PSU? - http://www.overclockers.co.uk/showproduct.php?prodid=CA-004-CS&groupid=701&catid=123&subcat=823. Also do you think the OCZ PSU was the cause of the sudden power down?.
 
fornowagain said:
It does sound like the PSU overloaded and shutdown. If it runs normally otherwise, try running Orthos/Prime95 on small ffts and 3dmark06 at the same time to see if it does it again. The two PSU you mention only have 7A@12V between them, not much of an upgrade at all. Try looking at something like the Thermaltake Toughpower 750W with 60A@12v.

http://www.overclockers.co.uk/showproduct.php?prodid=ca-064-tt&groupid=701&catid=123&subcat=926
Click to expand...

thank you for the reply :).

i'll get him to do the test but i think you're way off on the psu specs as the ocz has 18a on four 12v rails?. i've not even looked at the corsair 620w specs yet either but i've heard of them running 8800gtx sli with quad core ( i think ) so i thought it would be better than the 700watt ocz psu as it's a little dated in comparison and i've heard nothing but great things about these corsair psu's. then again , what i thought about psu's could be totally off :confused:.

http://www.extremeoverclocking.com/reviews/cases/ocz_gamexstream_700w_2.html

http://www.overclock3d.net/gfx/articles/2006/09/115813696188.jpg
 
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J.D said:
I'll get him to do the test but I think you're way off on the PSU specs as the OCZ has 18A on four 12v rails?.
Click to expand...
Unfortunately you can't just add rails, they all (typically) feed from the same primary. If it was four rails at 18A, i.e. 4x18x12=864w.
Each manufacturer has their own methods to describe wattage, some 'massage' the figures a little to bump the overall numbers.

OCZ 680-155=525W 43A@12v They've tied the 5v & 3.3V to the 12v output. Regardless of stated maximums that's what it could drop to.



Corsair HX620 600W 50A@12v


As I said there's not much between the two you've meantioned.

This is in a different price league, but power wise its the next step up.



Can't see a dual core system ever needing this much tbh.
 
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Output Characteristic
Model/Output +3.3V +5V +12V -5V -12V +5VSB Combined Power +12V1 +12V2 +12V3 +12V4
Regulation
±5%
±5%
±5%
±5%
±10%
±5%






HEC-550TD-PTE
30A
38A
18A
17A
0.3A
2A
550W


Will this run an XFX 7900GTX? Help appreciated.
 
Thank you very much for that fornowagain. I'm sure I understand it now. I'll recommend this PSU when my friend gets back from his holidays.

pattojones I have answered your post in your thread.
 
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