Hefemeister
Lord Techie,
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ATI Radeonâ„¢ HD 4850 System Requirements
* PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
* 450 Watt or greater power supply with 75 Watt 6-pin PCI Express® power connector recommended
The 450 would handle it as Corsairs are top quality power supplies.
I always like a little headroom for future upgrades so if possible I would look in the 550 to 650 range.
* PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
* 450 Watt or greater power supply with 75 Watt 6-pin PCI Express® power connector recommended
The 450 would handle it as Corsairs are top quality power supplies.
I always like a little headroom for future upgrades so if possible I would look in the 550 to 650 range.