Hi! My notebook is ASUS A6Ja with 1GB memory. Not long ago I decided to expand it to 2GB. As EVEREST said, I had 2 modules of 512MB brand Infineon. The only way for me was to buy two new modules. I decided to buy Kingston with their lifetime warranty. On their website I found suitable ones and chose "1GB 667MHz DDR2 Non-ECC CL5 SODIMM". However, I bought just one module in case that something goes wrong and thought I would buy the second one soon. I easily repalced two old ones with new one. BIOS found new peoce of memory without problems and continued to boot.. And nightmare started.. When Windows started and my usual software began to launch a blue screen of death appeared! Rebooted.. again.. blue screen.. Rebooted and worked! I started my system and everything was working fine. Even games didn't make anything bad to happen. So, it only appears when starting Windows, so i have to cross my fingers every time. I updated BIOS.. No change. It still appears. EVEREST says that my new memory is working ok. So, what's the problem then?? I feel confused. Maybe it is because there is just one module? If I buy the second, will it help? And a little bit unrelated question.. Is it normal that EVEREST says that the real clock is 167MHz, while the effective is 667? (it is with a new module) :confused:

According to Crucial.com, "Each memory slot can hold DDR2 PC2-5300, DDR2 PC2-4200 with a maximum of 1GB per slot." PC2-4200 = DDR533 @ 266MHz PC2-5300 = DDR667 @ 333MHz "Is it normal that EVEREST says that the real clock is 167MHz, while the effective is 667?" That would probably be for the CPU, not the RAM. The RAM is double-pumped but the CPU is quad-pumped. 167MHz x 4 = 667MHz (effective)

Thx for answer! So it shouldn't be increased? But how about the RAM? Do you have any ideas about it?

The CPU is supposed to run at 166MHz (667MHz effective)...the RAM is supposed to run at 333MHz (667MHz effective). http://www.asus.com/products4.aspx?...

It is running at 333MHz. But it crushes from time to time when I start Windows..

try running a memory diagnostics program such as memtest86 or Microsoft Windows Memory Diagnostic: http://www.memtest.org/ http://oca.microsoft.com/en/windiag...

I tried memtest tonight. It got 2 errors of 800% =(