RAM Issue , i think lol

I just purchased this PC the other day from tigerdirect... i bought a new power supply 630 watt , a new video card sparkle 8500GT 1gb , and 4 sticks of ram (OCZ PC2 6400 1gbram x 4 800mhz) 4-4-4 @2.1v.

I installed everything and it didn't work, so i took the ram out and put the stock ram back in ( PC2 5400 1gbram x 2 667mhz + PC2 5400 512mb x 2 667mhz ) and everything ran fine.

is there something i have too do too my BIOS? Im really not computer savvy more of a tinkering around hobby.

here is my motherboard specs , and then the whole stock PC.

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Form Factor

* µATX Form Factor
* 24.4 x 24.4 cm

CPU Support

* Socket AM2 (940 pins)
* AMD Athlon 64, Athlon 64 X2 Dual Core and Sempron processors
* 2 GHz HyperTransport interface speed

Chipset

* NVIDIA nForce 430 Northbridge with Integrated Graphics Processor
* NVIDIA nForce 405 Southbridge

System Memory

* DDR2 800/667/533, 4 banks with Dual Channel support
* Support for up to 4 GB system memory

Integrated Video

* NVIDIA Geforce 6150SE

Expansion Slots

* 1x PCI Express 16X
* 1x PCI Express 1X
* 2x PCI

Ethernet Controller

* LAN 10/100 (Marvell 88E8039)

Audio

* High Definition Audio subsystem using the Realtek ALC 888 audio codec

IDE (HDD, ODD)

* 4 SATA II connectors

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PC stock spec:



Specifications
Condition: Factory Refurbished

Operating Systems: Genuine Windows® Vista™ Home Premium 32-bit

Platform: PC

Orientations Allowed: Vertical

Form Factor: Tower

Bays: 2 - 5.25" Drive Bays
1 - 3.5" Drive Bays

Internal Bays: 3 - 3.5" Drive Bays

Available 3.5" Drive Bays: 1

Available 5.25" Drive Bays: 1

PCI Slots (Total): 2

PCI Slots (Available): 1

PCI Express X1 Slots (Total): 1

PCI Express X1 Slots (Available): 1

PCI Express X16 Slots (Total): 1

PCI Express X16 Slots (Available): 1

PCI Express Slots (Total): 2

PCI Express Slots (Available): 2

Expansion Slots: 4

PS/2 Keyboard Connectors: 1

PS/2 Mouse Connectors: 1

Serial Communication Ports: 1

Parallel Ports: 1

USB Ports: 6

FireWire Ports: 2

LAN Ports: 1

Audio Out Jacks: 2

Line In Jacks: 1

Microphone Jacks: 2

VGA Ports: 1

Processor Brand: AMD

Processor Class: Athlon 64 X2

Processor Number: 5000

Processor Speed: 2.60GHz

Processor Interface: AM2

Processors Supported: 1

Processors Onboard: 1

Additional Technologies: HyperTransport Technology
Dual-Core Technology

Memory Type: Dual Channel
DDR2

Memory Size: 2x512MB & 2x1GB

Total Memory: 3.0GB

Memory Speed: DDR2 667 (PC2-5300)

Memory Slots (Total): 4

Memory Slots (Available): 0

Maximum Memory Supported: 4.0GB

Interface: SATA II

Capacity: 400GB

Speed: 7,200RPM

Optical Drive Type: DVD±RW Dual Layer

Interface: EIDE

Type: Media Reader

Capacity: 15-in-1

Media Types: Compact Flash
MicroDrive
SecureDigital
Memory Stick
Multimedia Card
Memory Stick PRO
xD

Audio Description: Integrated Audio

Audio Chipset: High Definition

Channels: 7.1

Graphics Description: Integrated Graphics

GPU/VPU: NVIDIA GeForce 6150 SE

Video Memory: up to 128MB Shared Memory

Video Interface: VGA (15-Pin D-Sub)

Communications Description: Integrated LAN Support

Interface Type: RJ-45 - Ethernet Connector

Data Transfer Rate: 10Mbps
100Mbps

Communications Description: 56Kbps PCI Modem

Interface Type: RJ-11 - Phone Connector

Data Transfer Rate: up to 56Kbps

Power: 300 Watt

Mouse Type: Wheel

Buttons: 3

Scrolling Capability: Vertical

Connection Type: PS/2

Keyboard Type: Multimedia

Connection Type: PS/2

Front Speakers: 2

Height: 15.5"

Width: 7.25"

Depth: 16.5"


any input would be appreciated , I hope i put everything that is needed.

Thank you very much,