GIGABYTE GA-MA770T-UD3P vs Sapphire ATI RADEON HD 4890 (HDMI) 1GB GDDR

Problem; I was bought 3 WEEK AGO
AMD Phenom II X4 945 Deneb 3.0GHz Socket AM3 125 watt
GIGABYTE GA-MA770T-UD3P AM3 AMD 770 ATX AMD Motherboard - Retail
2 X Patriot Extreme Performance 2GB 2X1GB PC3-10666 DDR3-1333 CL7-7-7-20 PDC32G1333LLK
Sapphire ATI RADEON HD 4890 (HDMI) 1GB GDDR5 HD 11150-11-20R
SEAGATE 750GB BARRACUDA 7200.11 SATA 32MB CACHE 3.5 ST3750330AS
X-Finity™ 600 Watt PSU - Titanium

OS VISTA ULTIMATE 64BITS
TEST RESULT FOR 3D MARK VANTAGE 11,000 +- VERY POOR PERFORMANCE

OTHER PC 1 1/2 year ago
EVGA Nforce 790I Ultra LGA775 ATX DDR3 3 PCI-E X16 @ OC 3.6
Intel Core 2 Quad Q9450 Quad Core Processor LGA775 2.66GHZ Yorkfield 1333FSB 12MB
2 X EVGA 8800GT 720MHZ 512MB 2.0GHZ GDDR3 PCI-E Dual DVI-I HDTV Out Video Card 512-P3-N808-AR
2 X Patriot Extreme Performance 2GB 2X1GB PC3-10666 DDR3-1333 CL7-7-7-20 PDC32G1333LLK
SEAGATE 750GB BARRACUDA 7200.11 SATA 32MB CACHE 3.5 ST3750330AS
Tagan TG900-BZ 900W High Performance LED Modular Power Supplier W/POUCH and Tool
OS VISTA ULTIMATE 64BITS
TEST RESULT FOR 3D MARK VANATAGE 15,000 +-

OK IS IT MY VIDEOCARD PROBABLY NOT I TRY ONE MSI 4870 1 gig and my test result with 3D MARK VANATAGE is 10,000 +-

Is it because I'm with Vista 64bits?

Or somethink in the bios (patch 2)?

Please I need your help...