Added more Ram - Timings out? HELP!

[nmarshall0]

Hi, newbie at the memory timings etc so please bare with me, Im trying to get my head round it!

Had the following set up but wanted to add another 4gb:

Intel Core2 Quad q8300 @ 2.50ghz 1333.3mhz FSB
Motherboard Asus P5N-D (Latest BIOS revision 1401)
4GB Corsair PC2-6400 CM2X2048-6400C5DHX 1.9v
Windows Vista 64-bit

I purchased what I thought was the same 4GB RAM to add to this. However I seem to have got Corsair CM2X2048-6400C5 (minus the 'DHX' also 1.8v) and it is slightly different, although the timings and frequency should be the same. After adding this, my windows score for RAM decreased to 5.5 from 5.9 and I noticed no performance increase when using multiple programs. I also noticed the frequency should run at 800mhz and timings at 5-5-5-18, I have checked up on this using CPU-Z and found the following:

DRAM Frequency: 400.0mhz
FSB: DRAM: 5:6
CL: 5.0
tRCD: 5
tRP: 5
tRAS: 31
tRC: 22
CR: 2T

Slot #1
2GB DDR2
PC2-6400 (400mhz)
Corsair CM2X2048-6400C5DHX
JEDEC#1
Frequency: 270.0mhz
CL: 4
tRCD: 4
tRP: 4
tRAS: 13
tRC: 15
Voltage 1.80v
JEDEC#2
Frequency: 400.0mhz
CL: 5
tRCD: 5
tRP: 5
tRAS: 18
tRC: 22
Voltage 1.80v

Slot #2
2GB DDR2
PC2-6400 (400mhz)
Corsair CM2X2048-6400C5
JEDEC#1
Frequency: 270.0mhz
CL: 4
tRCD: 4
tRP: 4
tRAS: 13
tRC: 15
Voltage 1.80v
JEDEC#2
Frequency: 400.0mhz
CL: 5
tRCD: 5
tRP: 5
tRAS: 18
tRC: 22
Voltage 1.80v

Slot #3
2GB DDR2
PC2-6400 (400mhz)
Corsair CM2X2048-6400C5DHX
JEDEC#1
Frequency: 270.0mhz
CL: 4
tRCD: 4
tRP: 4
tRAS: 13
tRC: 15
Voltage 1.80v
JEDEC#2
Frequency: 400.0mhz
CL: 5
tRCD: 5
tRP: 5
tRAS: 18
tRC: 22
Voltage 1.80v

Slot #4
2GB DDR2
PC2-6400 (400mhz)
Corsair CM2X2048-6400C5
JEDEC#1
Frequency: 270.0mhz
CL: 4
tRCD: 4
tRP: 4
tRAS: 13
tRC: 15
Voltage 1.80v
JEDEC#2
Frequency: 400.0mhz
CL: 5
tRCD: 5
tRP: 5
tRAS: 18
tRC: 22
Voltage 1.80v

Now, Im pretty baffled. This goes beyond my knowledge. I need help. Do these figures look right? If not, can I adjust the timings and/or the voltage in BIOS so that they run at full potential? Or have I bought the wrong RAM which is pointless?

The system was freezing when I first installed the RAM, but after a fresh install of windows it seems to be stable.

PLEASE HELP!

[Tyree]

Mixing RAM often cause problems and filling all the RAM slots can cause problems. No game and very few apps can utilize over 3GB of RAM.
Try using only the two newer sticks to be certain they are OK.

[nmarshall0]

Is there that much difference? the frequency, timings, etc etc are all the same just the product code is missing 'DHX' off it whatever that is?

All the timings etc are set to auto in BIOS. Would setting these manually not sort it? If I knew what I was doing I would try it?

Thanks for the reply