What is with the PC (because of the RAM it gives out a blue screen)?

Question

Windows

There is an ECS 965PLT-A board, it has a supported RAM frequency from 533 to 667 MHz
. There is also a 2 GB patriot psd22g6672 RAM, which starts up quite easily on that board.
There is also NCP PC800, also 2 GB. Everything is going well for her as well.
But bad luck, if you put these two bars together, then a blue screen enters. The bios runs smoothly, and in the bios everything is normally shown and working. And if you put them separately (run only one bar separately), then everything loads normally.
2 GB is unbearably small for me, I wouldn’t put it on at least 1 GB, but no, the motherboard starts up, everything spins, but it doesn’t. (If you put 2 + 1, even if from this manufacturer)
I wanted to connect the speaker, it’s silent I know who, once squeaked because there was no RAM .....
What to do ?
I would like to start 2 + 2, at least 4 GB will be. But I don’t know what to do ....
Everything is ok with the disk and Windows on it, I checked it on another PC.

Everything is in order with the video card, I tested and played on it on another PC ....

Answer 1

Xs, as an option to buy on Avito one deshman plate for 4gb +

Answer 2

The problem with the maximum size of RAM per channel, or inconsistency in timings, try setting the timings manually in the BIOS