I (unfortunately) just built my first desktop using a Thermaltake TR2 430W. I'm looking to add a discrete video card and I've been told that this PSU can handle a Radeon HD 6770. Does anyone know if this PSU is enough for a HD 7770 since the new cards consume less power?
The Thermaltake TR2 - 430W (W0070RUC) should have a combined +12 Volt continuous current rating of 27 Amps. It does have one 75 Watt 6-pin PCI Express power connector.
For a system using a reference clocked single Radeon HD 7850 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 24 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.
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.
A reference clocked Radeon HD 7850 itself will only draw 8 Amps from the +12V rail during gaming and almost 8.5 Amps when running Furmark. That should be well within the Thermaltake TR2 - 430W (W0070RUC)'s capabilities.