2 MSI Geforce 7800 GTX Duds?!?!

I just bought two MSI Geforce 7800 GTX's and both seem to be faulty.
I've tried them in single mode, SLI mode, and on multiple computers
Both computers are MSI K8N Neo4 Platinum / SLI
2 GB Corsair RAM at 3 3 3 8 1T
One is an AMD Athlon 60 3000+
The other is AMD Athlong 64 FX-55
Both cards freeze on starting up windows right before the Windows XP PRofessional Loading screen. This occurs in SLI and in non-SLI mode running one card, as well as running on two diferent motherboards
Not only does it freeze when starting up windows but when trying to do a windows install as well freezes on the "starting up windows" portion when i tried to reformat
I have tried updating the BIOS for the MSI boards, it did nothing.
This was an upgrade from two MSI 6800 GT's
Should I return the pieces to the retailer?
Thanks =/
-Geilt

Powersupply is 550 watt Antec Truepower II (TPII-550)
# 2 low noise fans
# Dual 12V outputs, for stability and safety
# True Spec noise level of 21.3 dBA measured at an independent lab using ISO 7779 standard
# EPS12V compliant/ATX12V 2.01 compatible. 24-pin main power connector with detachable 4-pin section for universal motherboard compatibility
# 4 Serial ATA connectors
# PCI Express graphic card power connectors
# Dedicated output for more stability and less ripple noise
# Feedback circuits for tighter load regulation (±3%) to maintain accurate voltage to all components
# Industrial-grade protection circuitry prevents damage resulting from short circuits, power overloads, excessive current, excessive voltage , excessive temperatures
# Fan Only power connectors allow True Power to control case fan speeds, reducing total system noise
# MTBF: 80,000 hours
# Safety approval: CB, DEMKO, FCC Class B, FIMKO, EMKO, UL, VDE, TUV
# Gold plated connectors for superior conductivity
# Important Note: The TruePower 2.0 Fan Only connectors are designed to power standard fans only. Attaching thermally-controlled fans to these connectors will likely result in unpredictable and undesired behavior. Thermally-controlled fans should only be connected to the standard 4-pin Peripheral Power Connectors. Please do not connect more than three fans to the Fan Only connectors.
FEATURES
Maximum Power    550 Watts
Switches    ATX Logic on-off
additional power rocker switch
115/230 Volt selector switch
Special Connectors    ATX12V 4pin/8pin
3-pin Fan Sensor
Fan Only
SATA
Transient Response    +5V,+12V and 3.3V outputs return to within 3% in less than 1ms for 20% load change.
P. G. Signal    100-500ms
Over Voltage Protection
recycle AC to reset    +5V trip point < +6.5V
+3.3V trip point < +4.1V
+12V trip point < +14.4V
Leakage Current    < 3.5mA @ 115VAC
DIMENSIONS
Unit Size    5.9"(L) x 5.5"(W) x 3.4"(H)
15cm(L) x 14 cm(W) x 8.6 cm(H)
Net Weight    5lbs.; 2.3kg
INPUT
Input Voltage    115 VAC / 230VAC
Input Frequency Range    47Hz to 63Hz
Input Surge Current    < 60A @ 115VAC
Input Current    12.0A for 115VAC
6 .0A for 230VAC
Hold-up Time    > 17ms at Full Load
Efficiency    > 70%
EMI/RFI    FCC Class B
CISPR22 Class
OUTPUT
   +3.3V    +5V    +12V1    +12V2    +5V SB    -12V
Max. Load    32.0A*    40A*    19A*    19A    2.0A    1.0A
Min. Load    0.5A    0.5A    0.4A    0.4A    0A    0A
Load Reg.    ±3%    ±3%    ±3%    ±3%    ±5%    ±5%
Ripple V(p-p)    50mV    50mV    120mV    120mV    50mV    120mV
* +5V, +3.3V, +12V1, 12V2 maximum output 530 Watts max.
ENVIRONMENTAL
Operating Temp.    0 to 50ºC
Operating Alt.    Sea Level 10,000 ft.
Non-Operating Vibration    Operating: 10-300 Hz, 0.5G, 3 axes, 1 hr. ea. axis
Non-operating: 10-300 Hz, 2.0G, 3 axes, 1 hr. ea. axis
MTBF    80,000 hrs. @ 25ºC
Approvals    UL, CUL, FCC Class B, CB, TÜV

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2 MSI Geforce 7800 GTX Duds?!?!

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