Best RAM??

Hello Guys

I want to upgrade my RAM from 2 GB to 4 GB but i'm a bit confused about CAS Latency and Timing. My system specs are:

Motherboard: XFX n680i LT SLI
CPU: Core 2 Quad Q6600

I want to buy one of this RAM but i'm not sure wich is better for a high performance specially for 3d rendering, also i would like to OC my CPU to 3.0 GHz but i'm not sure which to buy. Please give some advices.

PS: I will buy a NVidia 9800 GTX+ 512MB too.

Here is the list(if you know a better choice please let me know):



OCZ Fatal1ty Edition 4GB (2x2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)

Cas Latency: 5
Timing: 5-4-4-18
Voltage: 2.1V

http://www.newegg.com/Product/Prod [...] 6820227334

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OCZ Fatal1ty Edition 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500)

Cas Latency: 5
Timing: 5-5-5-15
Voltage: 2.1V

http://www.newegg.com/Product/Prod [...] 6820227335

-----------------

OCZ Reaper HPC Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)

Cas Latency: 4
Timing: 4-4-4-15
Voltage: 2.1V

http://www.newegg.com/Product/Prod [...] 6820227267

-----------------

OCZ Reaper HPC 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500)

Cas Latency: 5
Timing: 5-5-5-18
Voltage: 2.1V

http://www.newegg.com/Product/Prod [...] 6820227289



Thanks and i hope to fine a solution here :-)