Solved GTX770 on a 550w PSU?

September 4, 2013 at 02:05:50
Specs: Win7 Home premium
Hi guys
My PC is fairly old, with a Core 2 Quad Q8400 (socket 775) and GTX260 216p and it all runs perfectly fine on a Thermaltake TR2 550w PSU.
Now I plan on building a new one, but I won't have all the money to buy everything so I plan on getting a new GPU first and running it temporarily in my current system, I was considering a GTX770, but I'm not sure if I'll need a better PSU. (Also I know the CPU will hold it back a bit but it's fine for now)
Also, I do know that the TR2 (which is discontinued) isn't actually 80+ efficient, according to the Thermaltake website it has >70% efficiency. Would it supply enough juice to power this system with a GTX770?

See More: GTX770 on a 550w PSU?

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✔ Best Answer
September 4, 2013 at 05:50:53
Wattage isn't the problem, amperage distribution is. Your Thermaltake has a multi +12v rail design with +12v1@14A & +12v2@15A rather than a single high amperage +12v rail. As long as you balance the load across the 2 rails, it should be OK. But considering the cost of a GTX770, I don't know why you'd want to risk it? And I don't know why you'd buy the card before anything else? For the $400+ it will cost you, you could practically build an entire system & then temporarily use the GTX260.

http://support.thermaltakeusa.com/P...



#1
September 4, 2013 at 03:08:21
Hi yogalD,

Refer to the link mentioned below in which Minimum Power Requirement for GTX770 is 600W:

http://bit.ly/17Nc5hX

The card may not work properly on the current PSU of your computer.

Thanks & Regards
Manshu S
#iworkfordell

message edited by DellManshuS


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#2
September 4, 2013 at 05:23:40
yogalD

Your power supply has 2 +12V rails that produce 16A@12V and 17A@12V. You need a PSU with a single +12V rail that has at least 34A. See the link below for power consumption of that card. See the second & third links below for a PSU. Both will do the job. The last one is modular. Use the promo code for more off.

http://www.tomshardware.com/reviews...

http://www.newegg.com/Product/Produ...

http://www.newegg.com/Product/Produ...


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#3
September 4, 2013 at 05:38:55
Ok, thanks for the answers. I'll only get a new PSU with the rest of my components. I guess in the meantime I'll go for a mechanical keyboard and wait to buy the GPU. THanks


Edit- by the way is it true that the 7950 uses more power than the 770?

message edited by yogalD


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Related Solutions

#4
September 4, 2013 at 05:50:53
✔ Best Answer
Wattage isn't the problem, amperage distribution is. Your Thermaltake has a multi +12v rail design with +12v1@14A & +12v2@15A rather than a single high amperage +12v rail. As long as you balance the load across the 2 rails, it should be OK. But considering the cost of a GTX770, I don't know why you'd want to risk it? And I don't know why you'd buy the card before anything else? For the $400+ it will cost you, you could practically build an entire system & then temporarily use the GTX260.

http://support.thermaltakeusa.com/P...


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#5
September 4, 2013 at 05:52:54
"by the way is it true that the 7950 uses more power than the 770?"

Nope. Even your GTX260 uses more power than the HD 7950.

http://www.hwcompare.com/14642/gefo...

EDIT: here's your current card vs the GTX770:

http://www.hwcompare.com/14717/gefo...

message edited by riider


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#6
September 4, 2013 at 10:43:00
See the link I posted above. According to those numbers the 7950 pulls slightly more than the 770.

Both of the PSUs I posted are on sale NOW.


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#7
September 4, 2013 at 11:05:25
Hi yogalD,

GTX770 requires more power than AMD Radeon HD 7950. For power requirement of AMD Radeon HD 7950, refer to the link mentioned below:

http://bit.ly/11v8geZ

Thanks & Regards
Manshu S
#iworkfordell


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#8
September 4, 2013 at 13:47:02
My error, I was looking at a HD 7970 in the charts.

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#9
September 4, 2013 at 19:04:42
Why go backwards, get the power supply first, you may not see much difference, but you can definitely use it later. Or, do what OtheHill suggests, buy nearly everything else and get the system up and running using the old graphics card to prove it works, and buy it of one slightly cheaper when you can. Or, a third option, buy the power supply and everything else that is a really a good buy as they go on sale until you have enough to build.
http://www.microcenter.com/site/bra...
http://promotions.newegg.com/NEemai...

You have to be a little bit crazy to keep you from going insane.

message edited by Fingers


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#10
September 4, 2013 at 23:45:22
Of course, but I could always wait for a sale on other components before buying and I don't really need anything yet at this moment

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