Vista - 1066Mhz vs 800Mhz memory ram.

A) Will i see any difference if i use 4GB 1066Mhz instead 4GB 800Mhz of ram?
B) Is it better to use 4x1GB or 2x2GB?
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My Pc Specs:

Case: A-Case Twin Engine BB With 3 thermaletake smart case fan II(inside flow) and 1 arctic cooling fan (outside flow)

Power Supply: Seasonic 700W 80plus

MB: Gigabyte GA-X38-DS4

RAM: 4GB Kingston 2x2GB at 800mhz

CPU: Intel Core 2 Quad Q6600

Graphic Card: Ati Radeon HD 3870x2 1080P

Sound Card: Realtek High Definition Onboard

HD c:\150GB Raptor 10.000 RPM d:\320GB WDC e:\320GB WDC

Dvd Drive: f:\Sony Sata high speed read\write

Vista Ultimate 64bit Sp1

Monitor Samsung LE40A656F1 1080p 100Hz LCD HD TV 50,000:1 connected HDMI<->HDMI

You need to post system specs in order to get an answer that question.

I believe the Q6600 uses 1066 RAM. You would see proper performance with 1066.

That would be dependent on the motherboard, and not necessarily the Processor.

Example, I have a Q6600 + PC8500 (1066) RAM, However, since my motherboard does not support 1066MHz RAM, the highest speed the RAM will run is 800MHz.

In this case I use the higher clocked RAM for overclocking my processor and maintaining a balance between between processor and memory in terms of bottlenecking.

I would recommend getting the correct motherboard for that processor.

Huh???

If the CPU supports 1066 RAM and his board does not, upgrade the motherboard to take advantage of the better RAM.

OK...That makes better sense then where I thought you were going.

At any rate, my OC Q6600 on it's 975XBX2 MB, with the added headroom RAM, works just fine here. My next system will be an i7 system.

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2 Questions

A) Will i see any difference if i use 4GB 1066Mhz instead 4GB 800Mhz of ram?
B) Is it better to use 4x1GB or 2x2GB?