Should I upgrade my PSU before getting an HD7970?


Dec 11, 2011
Well I plan on getting an HD7970 and I was wondering if I should upgrade my PSU first, if its "safe" to use my current PSU with the new card.

I currently have an Antec BP550 Plus 550W power supply ( )

I will be running the card in a PCIe2.0 x16 slot, rather than a 3.0.

I want to know if this will work, and if so, will I lose any performance. (I plan on upgrading my PSU in the future, but I really want this card now :])

Here's the rest of my specs:

AMD Phenom II x6 1090t @ 3.2GHz
16GB DDR3 RAM at 1333MHz
Biostar TA990FXE Motherboard
One DVD Burner Drive (24x)
750GB 7200RPM Hard Drive

I wouldn't trust it.

For a system using a single Radeon HD 7970 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 38 Amps or greater and have at least one 6-pin and one 8-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

The Antec Basic 550 Plus (BP550 Plus), with its combined +12 Volt continuous current rating of 32 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is insufficient to power your system configuration with a single Radeon HD 7970.

If you get a card that adheres to the AMD reference design clock speeds for GPU core and memory, and you don't manually overclock the card or run Furmark, then you may be able to use your existing power supply.

For a 550 Watt power supply the Antec Basic 550 Plus (BP550 Plus) has a rather weak combined +12 Volt continuous current rating. A decent 550 Watt power supply will have a combined +12 Volt continuous current rating of 45 Amps.

Wow ct
Take it easy
Maybe should have said "high quality" 550
The original BP550 was only 32 amps, maybe ko didn't open the link but looked here

PS; the overclocked 3960x in the Anand review uses a good deal more power than a 1090T
It's a perfect example of Antec's stupidity in using exactly the same model number with no way of knowing which one you're going to get until you look at the label. At least they could have added a version suffix to the model number.

I'm sure it was done this way so that the uninformed wouldn't know about the change because they would just be looking at the total wattage. This prevents the old version stock from being left on the shelf because everyone would want the later version.

I can clearly see +12V1, +12V2, +12V3, max. load: 384W on the label. That's a combined +12 Volt continuous current of 32 Amps to me.