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AMD 7730 Power Consumption

Last response: in Graphics & Displays
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July 31, 2013 12:28:14 PM

Basically, my friend in Sweden wants some help picking a graphics card, because his GT 620 is a crap piece, and lags along at 30FPS when he plays games like Chivalry, Arma, Skyrim on the lowest settings.

His computer is HP and it has a 300w HP PSU which provides a 16a 12v rail to his motherboard, with no extra power cables for a card that requires more power than the PCI can provide, not that the PSU could handle a really powerful card anyway.
So I was looking at the Sapphire AMD 7730 1gb GDDR5 graphics card for him, it fits his budget, it's performance is a big step up and it isn't power hungry. But I don't know if a 16a 12v rail provides enough power for it, that's my ultimate question. I heard a 7750 really requires a 19a 12v rail.

It's worth noting that his PC has an Intel I3 2120 CPU, so it doesn't use much power, leaving enough for a PCI powered graphics card I think.

Thank you for your time.

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a b 4 Gaming
a b À AMD
a b U Graphics card
July 31, 2013 12:47:00 PM

Ha, both HD 7730 and 7750 don't need a 6-pin additional Power supply (so just plug the card into the slot is OK). Personally I prefer HD 7750 'cause it has 1/4 more graphic process power than 7730. ;) 

a HD 7750 has 55W TDP (while HD 7730 has 47W, only 8W less), that means your PCI-E x16 slot is enough for it. (A PCI-E x16 slot provides 75W max power). 55W TDP is like 4-5 amp times 12V (while 47W has similiar requirement), so it should be enough for your PSU to power up the 7750.

But HD 7770 has 80W TDP, that exceeds your need.

Here is something that can help.
http://gpuboss.com/gpus/Radeon-HD-7750-vs-Radeon-HD-773...
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July 31, 2013 12:57:50 PM

Maxime506 said:
Ha, both HD 7730 and 7750 don't need a 6-pin additional Power supply (so just plug the card into the slot is OK). Personally I prefer HD 7750 'cause it has 1/4 more graphic process power than 7730. ;) 

a HD 7750 has 55W TDP (while HD 7730 has 47W, only 8W less), that means your PCI-E x16 slot is enough for it. (A PCI-E x16 slot provides 75W max power). 55W TDP is like 4-5 amp times 12V (while 47W has similiar requirement), so it should be enough for your PSU to power up the 7750.

But HD 7770 has 80W TDP, that exceeds your need.

Here is something that can help.
http://gpuboss.com/gpus/Radeon-HD-7750-vs-Radeon-HD-773...


Doesn't the 12v rail have to power the CPU too though?
We were looking at the 7750 by the way but heard that it needs a 19a rail. Just trying to ask if the 16a rail is enough for an I3 2120, motherboard and ram, GPU and general innefficiency.
Because lets say hypothetically, under load the system draws 180w, that is pretty close to 12v x 16a. Just checking, not trying to dis your answer, but I thought the 12v rail has to power everything on the mobo?
(Been a while since I built my PC now, plus I just over-killed with the PSU and got a 750w Antec)
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a b 4 Gaming
a b α HP
a c 153 À AMD
a c 285 U Graphics card
July 31, 2013 1:21:37 PM

You have an HP PSU with just a single 16A (+12V) rail? There's not a 2nd one about that size?
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