have CM2X1024-6400C4D want TWIN2X4096-6400C4DHX will it mix?

[Muzzzz]

I'm thinking about getting

Corsair TWIN2X4096-6400C4DHX / 4GB PC2-6400 800MHz / XMS2 DHX Xtreme Performance TwinX Matched DDR2 Dual Channel Memory

& have

I have (see bellow)

Model : P5W64 WS Pro

Logical/Chipset Memory Banks
Bank 0 : 512MB DDR2 4-4-4-12 1T
Bank 1 : 512MB DDR2 4-4-4-12 1T
Bank 4 : 512MB DDR2 4-4-4-12 1T
Bank 5 : 512MB DDR2 4-4-4-12 1T
Supported Memory Types : ECC DDR2
Channels : 2
Memory Bus Speed : 4x 213MHz (852MHz)
Maximum Memory Speed : 4x 200MHz (800MHz)
Multiplier : 10/16x
Width : 64-bit
Memory Controller in Processor : No
Performance Acceleration Technology : Yes
Refresh Rate : 7.80µs
Power Save Mode : No
Fixed Hole Present : No
Maximum Memory Bus Bandwidth : 13.31GB/s

Memory Module 1
Manufacturer : Corsair
Model : CM2X1024-6400C4D
Extended Information : mVNP 7
Type : 1GB DIMM DDR2
Technology : 16x(64Mx8)
Speed : PC2-6400U DDR2-400
Standard Timings : 5.0-5-5-18 3-22-6-3
Version : 1.2
Date of Manufacture : 16 July 2006
Memory DC Line : 1.80V
Set Timing @ 400MHz : 5.0-5-5-18 3-22-6-3
Set Timing @ 270MHz : 4.0-3-3-12 2-15-4-2
Enhanced Performance Profiles : Yes
Profile @ 400MHz: Optimal : 4-4-4-12 X-22-24-X 2T 2.1V

Memory Module 2
Manufacturer : Corsair
Model : CM2X1024-6400C4D
Extended Information : mVNP 7
Type : 1GB DIMM DDR2
Technology : 16x(64Mx8)
Speed : PC2-6400U DDR2-400
Standard Timings : 5.0-5-5-18 3-22-6-3
Version : 1.2
Date of Manufacture : 16 July 2006
Memory DC Line : 1.80V
Set Timing @ 400MHz : 5.0-5-5-18 3-22-6-3
Set Timing @ 270MHz : 4.0-3-3-12 2-15-4-2
Enhanced Performance Profiles : Yes
Profile @ 400MHz: Optimal : 4-4-4-12 X-22-24-X 2T 2.1V

[Yellowbeard]

Most likely it will work but it cannot be guaranteed to be stable. We do not recommend mixing different memory together as it may cause instabilities.

[Muzzzz]

Thanks! ( had a feeling you may say something like that )

[Muzzzz]

Just running memory tests now, had to clock down the memory a little because of the poor memory controller (new mobo's would prob be fine as they have much better controllers these days (my P5K @ work is nice)
My main point is that in my experience the different modules are running perfectly together on this hardware :-)