Gigabyte MA790FXT-UD5P
AMD Phenom II X4 955 Black Edition clocked at 3.2GHz (1.325v Stock Volts)
Sapphire ATI Radeon HD 4890 Vapor-X 2048MB(Stock Clock)
OCZ 2x2GB PC3-1333C7 PlatinumWD VelociRaptor 300GB
Creative Sound Blaster X-Fi Titanium - Fatal1ty Champion Series
3 x YATE LOON 120mm Case Fan - D12SL-12
Ambit Broadband Modem
40°C idle = 192W

53°C load = 280W (Using LinX)

48°C load = 275-285W (Playing Test Drive Unlimited)

49°C load = 304W to 311W (Using Street Fighter IV Benchmark)

50°C load = 306W to 315W (Using Crysis Benchmark)
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Gigabyte MA790FXT-UD5P
AMD Phenom II X4 955 Black Edition clocked at 3.8GHz (1.450v Volts)
Sapphire ATI Radeon HD 4890 Vapor-X 2048MB (Stock Clock)
OCZ 2x2GB PC3-1333C7 PlatinumWD VelociRaptor 300GB
Creative Sound Blaster X-Fi Titanium - Fatal1ty Champion Series
3 x YATE LOON 120mm Case Fan - D12SL-12
Ambit Broadband Modem
45°C idle = 230W

65°C load = 265W (Using LinX)

58°C load = 335W to 340W(Playing Test Drive Unlimited)

56°C load = 347W to 357W (Using Street Fighter IV Benchmark)

57°C load = 350W to 360W (Using Crysis Benchmark)

Conclusion

(-) Sapphire ATI Radeon HD 4890 Vapor-X 2048MB uses 20W more at idle than BFG GeForce GTX 295 1792MB

(+) Sapphire ATI Radeon HD 4890 Vapor-X 2048MB uses 50W LESS on full load than BFG GeForce GTX 295 1792MB