a 300w PSU with Radeon HD 7770

The Dude · Feb 23, 2014

Hello guys, i've an HP pavilion p6721, with an i5-2300 processor (which consumes about 90-95 W), 1TB 7200rpm hard drive, 4 GB of 1333Mhz DDR3, and a 300w PSU
my question is, can this computer handle a Radeon HD 7770 GPU, which consumes a max of 85W (i'm not an expert but 85+95+ hard drive and other devices can never exceed 250w at max)
the problem is, in this GPU's official website, it says that you need at least a 500w PSU (or greater), so should i buy this? or the less power consuming 7750??
thanks in advance

rolandzhang3 · Feb 23, 2014

You'd be better off getting a GTX 750 or 750 Ti (the models without the power connector), they perform better than the 7770 whilst consuming less power

Wattage isn't everything, read your PSU sticker and check the amperage under the +12v rail, multiply that by 12 and that's the total output that the 12v rail can handle

Gam3r01 · Feb 23, 2014

The recommended power is overstated. I have seen the card run on 300 watts. The card draws power through the motherboard meaning it can only take 75w from the lane, so the card draws equal or less.
Unless you have the card now the Ti is better.

The Dude · Feb 23, 2014

rolandzhang3 :

thank you, but the problem here is that GTX 750 is more expensive, and i'm a poor college student, i wanted the Radeon HD 7770, because it's the cheapest GPU available that can play last gen games

The Dude · Feb 23, 2014

Gam3r01 :

actually it has a 6 pin power connector, means it can take power directly from PSU
i don't have the card actually, but i'm worried about finding a better choice with a similar price

Dark Lord of Tech · Feb 23, 2014

A Radeon HD 7770 needs at least 19 amps on the 12v rail and a 500 watt power supply.

The 12v rail is the key and I doubt that hp has 19 amps on the 12v rail.

It may run it but not for long.

rolandzhang3 · Feb 23, 2014

Ah makes sense, I wouldn't exactly recommend the 7770 for a system with a weak OEM PSU which is usually low quality and does not handle well under stress at all

If you were going down the 7770 route it'd be best to grab a new PSU, and by then the accumulated cost would be similar to that of just grabbing a 750

Gam3r01 · Feb 23, 2014

For the price you wont find much better (7790 maybe) or the 750 in the same price.

The 7770 I had didnt have external power, it was an older model though. Some of them have external ports. The Ti can be found in the same price range, http://www.newegg.com/Product/Product.aspx?gclid=CN2u_7yz47wCFdeUfgod3hUACQ&Item=N82E16814487027&nm_mc=KNC-GoogleAdwords&cm_mmc=KNC-GoogleAdwords-_-pla-_-Desktop+Graphics+Cards-_-N82E16814487027&ef_id=Uh16zgAAATp4NNzx:20140223232849:s

rolandzhang3 · Feb 23, 2014

You had a 7750 didn't you? and yeah it'd be in your best interest to grab a 750/750 Ti depending on your local prices, it's more powerful than a 7770 and uses much less power

Gam3r01 · Feb 23, 2014

I had both at a time, the 7750 was for my personal PC, the 7770 was on a friends I was working on.

The Dude · Feb 23, 2014

well, thank you guys

, buying a 7770 and a 500W PSU is more expensive than just buyng a GTX750, so i guess i have to go with the GTX

rolandzhang3 · Feb 23, 2014

Hope that goes well :lol:

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