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Decision for PSU

Last response: in Components
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June 7, 2013 3:43:33 AM

Hello guys, I'm a bit confused in choosing a PSU that's why I'm asking for your help.

My specs:
Mobo: ASUS P5Q3 Deluxe
CPU: Q6600 @ 3,2 GHz 1,28v
GPU: HD 4670
RAM: Kingston HyperX 1600 MHz 2x2 Kit 4GB
PSU: Dell ~330W

I want to upgrade my video card but I have to buy a new PSU first. I can't decide because I'm not really a PSU expert. My budget for PSU is 100$ (In my country the value is different but lets count it as dollars for you). I want the PSU to run almost any single video card or I might crossfire with 6770/7770. In the future I might even buy a new PC with higher wattage requirements and I don't want to change the PSU again so it has to be futureproof. I threw an eye on Seasonic SS-620GB for 100$, Cooler Master GX-650W for 100$, Fractal Design Integra R2 750W for 95$, Thermaltake SMART 630W for 90$. Basically I'm aiming at 600-650w Power supplies. The main problem is I can't purchase from amazon, newegg, ebay or any site because there's no shipping to my country or it'll cost like 50$. About the video card, I know it can't be from the latest models because my CPU and motherboard are kinda old but I'm not planning to change them, atleast for now. But in my opinion 6770/7770 CF, 6850/7850 would be good from AMD cards or GTX 460/GTX 470, GTX 550Ti/GTX 560Ti from Nvidia cards.

All suggestions are welcome, thanks in advance.

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a b U Graphics card
June 7, 2013 4:34:02 AM

Well I'm not really a expert on this stuff but you have a pretty big budget for just a PSU so I suggest 700 watts to 800 watts and get it modular if possible. Modular PSU's are PSU's that have all the cables separates so you only you plug in the ones you need which helps with cable management and airflow.
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June 7, 2013 6:43:39 AM

You guys think my budget is big because I wrote I set it as dollars because you don't know how much dollars is BGN. In BG the PC components are a bit more expensive than the prices from newegg, amazon, etc.. Example: In BG the SeaSonic G Series SSR-550RM is 165 BGN which is equal to 112$, but in newegg it's 80$ which is equal to 120 BGN. That's my main problem about buying a PC components and I can't get them delivered because I have to pay like 50-60$ shipping to here.

@SR-71 Blackbird - I wonder how only 550w are SLI Ready/CrossFire Ready? I mean it doesn't have so much watts, maybe the amps are high but I still don't get it. Can you explain me a little, please?

PS I just checked the SSR550-RM has 45 amps on 12v rail, GTX 295 says it requires 46 amps on 12v rail, can this PSU run it or no?
a c 1108 ) Power supply
a c 504 U Graphics card
June 7, 2013 7:44:18 AM

An NVIDIA reference design GeForce GTX 295 can draw up to 26.2 Amps from the +12V rail(s) when running Furmark. It should be less than 20 Amps during gaming.

NVIDIA usually adds another 15 Amps on the +12V rail to handle the remainder of the system. This is based on a 130 Watt TDP CPU system (e.g. Intel Core i7-3930K 3.2GHz). Your Intel Core2 Quad Q6600 Processor has a TDP of 105 Watts so it'll uses less power than NVIDIA's reference system.

The 46 Amps that NVIDIA specifies is 5 Amps more than the minimum required for a system using a GeForce GTX 295. It is always a good idea to have some spare capacity to handle capacitor aging.
June 7, 2013 9:16:39 AM

Thank you for this explaination mate, I really appreciate it. I linked these Power supplies because I can buy them from a local shop and I'm thinking to buy the Seasonic SS-620GB because it seems to be my best choice. It has 48 amps on +12V rail so it should handle any single GPU. My last question is can it handle two cards like 6770 or 7770 in CrossFire?

PS As far as I see it has one 6 pin and one 8 pin PCI-E connectors, which mean it can run two cards which require one 6 pin connectors each? And it can run one 6970(example) which require one 6 pin and one 8 pin?

• Wire Configuration
Main Power (24P / 20P) 550mm - 1
EPS12V/ATX12V (8P / 4P) 550mm - 1
EPS12V (8P) 550mm - 1
Peripheral (4P) - 6
SATA - 9
FDD (Y-adapter) (4P) - 2
PCI-E (6P) 570mm - 1
PCI-E (8P / 6P) 600mm - 1
a c 260 ) Power supply
a c 109 U Graphics card
June 7, 2013 9:26:24 AM

Denis Todorov said:
Thank you for this explaination mate, I really appreciate it. I linked these Power supplies because I can buy them from a local shop and I'm thinking to buy the Seasonic SS-620GB because it seems to be my best choice. It has 48 amps on +12V rail so it should handle any single GPU. My last question is can it handle two cards like 6770 or 7770 in CrossFire?


Hi - of the PSU's you listed above the Seasonic is the best (only actually) choice, and is
IMO the best maker of PSU's. It is sufficient to CF the 7770's or 6770's you mentioned.

a c 1108 ) Power supply
a c 504 U Graphics card
June 7, 2013 9:34:36 AM

Denis Todorov said:
Thank you for this explaination mate, I really appreciate it. I linked these Power supplies because I can buy them from a local shop and I'm thinking to buy the Seasonic SS-620GB because it seems to be my best choice. It has 48 amps on +12V rail so it should handle any single GPU. My last question is can it handle two cards like 6770 or 7770 in CrossFire?

PS As far as I see it has one 6 pin and one 8 pin PCI-E connectors, which mean it can run two cards which require one 6 pin connectors each? And it can run one 6970(example) which require one 6 pin and one 8 pin?

• Wire Configuration
Main Power (24P / 20P) 550mm - 1
EPS12V/ATX12V (8P / 4P) 550mm - 1
EPS12V (8P) 550mm - 1
Peripheral (4P) - 6
SATA - 9
FDD (Y-adapter) (4P) - 2
PCI-E (6P) 570mm - 1
PCI-E (8P / 6P) 600mm - 1


A Seasonic SS-620GB should have no problem powering a system using two Radeon HD 6770 or Radeon HD 7770 in 2-way CrossFireX mode.

The 8-pin connector is really a (6+2)-pin connector and can be used as either a 6-pin connector or an 8-pin connector.

Yes, you can run it with one Radeon HD 6970.
June 7, 2013 12:17:06 PM

Thanks to everyone for answering all of my questions. I'm gonna get the Seasonic.
a c 1434 ) Power supply
a c 529 U Graphics card
June 7, 2013 12:17:58 PM

Good choice.
!