Mixing memory from two manufacturers

Hi guys,

I recently bought 2x2GB sticks of Corsair 800 MHz DDR2 memory:

[URL Blocked!]

I had 2x1GB sticks of Hynix memory, which I believe (not 100% sure) is also 800 MHz. On the chip it says:

1GB 2Rx8 PC2-6400U-55-12
HYMP512U64CP8-S5 AB-C 0807

See the data sheet on Hynix's website:

[Gah, URL blocked again!]



My question is, would I be sacrificing performance on the Corsair model if I left the Hynix memory in for a total of 6GB?

Thanks!