Problems Upgrading RAM, two different manufactures

Hi all.

This is my problem.

Im trying to upgrade my RAM memory from 2GB to 4GB (I run Windows Vista 64)

My Motherboard, with a Core 2 Duo 6600 installed
Asus P5N32-SLI Premium

Old Ram installed
Kingston DDR2 800, 4-4-4-12, 2x1GB, 2v.

New Ram installed
A-Data DDR2 800, 4-4-4-12, 2x1GB, 2v.

Once I installed the second memory pair ( both kingston and Adata installed properly in motherboard slots so they can run in Dual Channel) I noticed windows vista started to run very slow. Even the window starting is now x2-x3 longer than before, and all applications I run in windows work very slow too. Some games are unplayable.

I tried each memory set independently, and both work very well at 800 setting, timing 4-4-4-12 and 2v.

With both memory sets installed I tried everything (I think) in BIOS.

-Tried at 800, with all timing in auto. Windows go slow.
-Tried at 800, forcing timing to 4-4-4-12, same thing.
-Tried at 800, forcing timing to 4-4-4-12, and forcing 2v. Same result.
-Tried at 667, all in auto. Windows slow again
- ... at 667, forcing timing to 5-5-5-15. Same.
- ... at 667, forcing timing to 5-5-5-15 and forcing 1.9v. Again Windows go very very slow.

Im about to give up and buy anpther set of A-Data memories, so if it is a compativility problem I will solve it.
But I still have the doubt that maybe is a motherboard problem, or maybe changing some setting in Bios I will solve that issue.

Any advice will be very welcome

I had same kind of problem since I uppgrade from 2GB to 4GB--> Vista starting slowly--> I did not find any problems, after 6H of testing...
I put my memory in diffrent order. Fist startup was slow but after restart it did run like a dream.

Thanks all for the tips

Indeed it was a motherboard issue Seems to be a know problem with that asus model, and when you fill all 4 RAM slots all system go slow ^^ so weird, and my bad for not think about the motherboard before.
Just upgrading the BIOS to the last one solved the problem.
Tho, I had to set myself all BIOS settings to make the memories work properly, even the voltage. If I leave it in auto it gives me a windows error ^^
So the memory is working now at 800, 4-4-4-12, 2v. and windows and games seems very stable.


btw, any reliable memory-speed test software you can recommend me? I already did check them with Memtest86+ 2.01 and at least theres no errors

I always use DOS to upgrade a BIOS.
Somehow to upgrade a BIOS from Windows scare me a little *g*
I use to boot the system in DOS with a CD for that, and run the tool from the hard disc. Never had a problem doing it this way.

Dont flash the Bios from a floppy disc, it can give you errors

i'm starting learn more and more on this topic,,, the system is built w/ 512mb w/ a page file of 344?/?(WHILE RUNNING,,check intask manager) or a 1024 //??//797???,, EVEN AFTER UPGRATING YOUR SYSTEM WITH MORE RAM THE SYSTEM STILL RUNS THE SAME!!!!! freezing crash!! ?? changing the ram will effect the timing of all other components, simple task OK!! day to day reboot to reboot will cause issues<< don't forget about updates,, if your not a nerd named Fester leave it alone and adjusting page filing as well,, buy your system and leave at is<, maybe its time for a new sysyem or call Fester,, live and learn!!