Quote Originally Posted by DaWaN
I use Corsair 5400C4 SPD now, works fine

You just have to boot with a stick in slot 2/3/4 and then in windows push the stick STRAIGHT in slot 1, then you can flash the stick
Is it safe to put memory while ur computer is working?

Sad thing is that i cant boot my system with thoose fat bodys even with other mem at bank 1,2,3 or 4 and thats trange. Im gonna try Your method then.
If i cant get that spd im looking for i gonna modify oryginal one.
Theres nice page with all bits well described.

As You can see - there is possibility to write own spd by editing values to match higher timings if You need it.
Im gonna try with thoose 53E and then 667 soon.
Still im bit aware of putting mem into working comp.