Hi kepacek,

Thank you for writing to the Dell Community Forum.

This motherboard supports LGA socket 771-pin Land Grid Array (LGA) package. The below processors are compatible.

Please reply if you have any further questions.

You’re welcome. The memory modules supported are:

Quad Channel FBD-DDR2 (Fully Buffered DIMM) Memory support
ECC PC2-4200F 533 MHz or PC2-5300F 667 MHz FBD-DDR2 SD-RAM
256 MB, 512 MB, 1 GB, 2 GB DIMM, or 4 GB DIMM sizes
512 MB minimum/64 GB maximum (with optional memory riser cards)

Yes, it should support them.

Thank you very much
Still, I wonder what memories can buy for upgarede my Dell P 690?
What type is suitable?
these are okay?
New For Hynix eight gigabytes PC2-5300F 4x2GB DDR2 ECC 240pin Fully Buffered DIMM Memory FB-Ram

Well thank you very much.

Please have another problem

My Dell Precision 690 reported bug. flickered numbers 1 3 It was wrong power adapter. After replacing power from 750W to 1KV everything was fine. Two weeks worked without problems. Today I turn on the PC and it's here again. And not run again flashing numbers 1 3 green. Please what is happening? Please help :-(

The flashing green 1 3 indicates a problem with the power supply unit. The power supply unit may be bad or cable may be crimped creating a short on a main power rail.