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Is 430W good enough for a HD 6850/6870?

Last response: in Graphics & Displays
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November 25, 2012 3:09:13 PM

I plan on getting a HD 6850 or a 6870 but I currently have a Thermaltake TR 430W PSU. Would that be able to handle either one of those GPUs?

More about : 430w good 6850 6870

a b U Graphics card
November 25, 2012 3:15:56 PM

It's enough for a 6850 but not for a 6870 because it only has one 6 pin PCIe power conector.
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a b U Graphics card
November 25, 2012 3:19:13 PM

You can use a molex to pcie adapter for the other power socket. Should be plenty of power.
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a c 547 U Graphics card
November 25, 2012 4:59:15 PM

For a system using a single reference design Radeon HD 6870 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 27 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

For a system using a single reference design Radeon HD 6850 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 25 Amps or greater and have at least one 6-pin PCI Express supplementary power connectors although there are some models that require two.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated @ 45-50°C ambient temperature, is the most critical factor.

You may find power supplies on the market that supply more than enough Wattage to run the system. However, many of them lack the Amperage capacity on the critical +12 Volt rail, which is necessary to properly power the critical components in the system (i.e. CPU and GPUs). This is the reason why graphics card manufacturers overstate the power supply wattage, usually by at least 50 Watts, to take into account those power supplies that have the weaker +12 Volt rail(s).

The Thermaltake TR2 430W (W0070), with its combined maximum +12 Volt continuous current rating of 23 Amps and with one 6-pin PCI Express supplementary power connectors, is insufficient to power your system configuration with a single Radeon HD 6850 or with a single Radeon HD 6870.

This is what X-bit labs found during their review of the Thermaltake TR2 430W (W0070):

• The PSU is manufactured by HEC/Compucase.

• at a load of about 380W, the PSU’s switching transistor overheat and burned down in the power supply. It was so hot that the insulating plastic spacer under the screw the transistor was fastened with melted.

• This is in fact an ATX12V 1.3-compliant 300W unit from HEC reinforced with a second fan. This may make it a 330W unit, but not better.
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a b U Graphics card
November 25, 2012 5:03:41 PM

Thermaltake does not make good PSU's, at all. The Corsair CX430W V2 is a better choice for $37 shipped, $17 after rebate.

Edit: Using a Molex to 6-pin adapter can be done but is not recommended. Their isn't much of a difference between the 6850 & 6870 if the 6850 is OC'ed. The only difference is the 6870 has a higher shader count. Another option is to get a 7770 (single 6-pin) and OC that. Their's only a 2-3 FPS difference between the 7770 & 6850.
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a b U Graphics card
November 25, 2012 6:21:10 PM

Good info, guys. I stand corrected....
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