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02-13-2020 06:40 AM - edited 02-14-2020 12:55 AM
I have read here a post about memory problem of HP XW6400 but my problem is different. (bios 02.38 Rev. A)
I had it with 4 modules of 1GB ( Hynix DDR2 PC2-5300F 667Mhz EEC Fully Buffered RAM) with HP sticker on it
I bought 2 x 4GB modules of same Hynix (with radiator) but without HP sticker. computer don't start and only beep 5x to tell memory problem.
I bought 2 other 4Gb modules also hynix , recieved with IBM sticker. don't work.( no screen and 5 beep) . If I put 2, 4 or 1 4GB module.
If i put one original 1GB module with a 4GB , screen appear with memory error (207 - incompatible memory modules detected slot 4) on the 4GB slot.
XW6400 is made to use 4x4 GB ram so I don't understand the problem.
is there a version of XW6400 that don't support 4GB module?
Solved! Go to Solution.
02-13-2020 12:45 PM
the xw6400 uses PC2-5300 "Fully Buffered" ECC DDR2 SDRAM which is known as FBDIMMs which is different than normal DIMM memory
please post the memory module number of what you bought i suspect it's not "FB" dimm memory
below is a FBDIMM memory kit from amazon
02-14-2020 07:43 AM
if all ram is "FB" dimms then you are not loading the ram in the correct order, each memory bank is two modules and each bank must have the same size modules you can not mix 1 and 2 gb dimms in a bank
please read the hp service guide for the xw6400 or look on the side panel for the correct load order
02-14-2020 11:18 AM - edited 02-14-2020 11:26 AM
I read this manual before asking help, I first use the 4 4gb modules, then try with only 2 modules (slot 1 and 3).
Pc only start with 1Gb modules...
Even after 30 years of PC building there is always new failures to "fight"
PS there is only one CPU in this case I wonder if it could prevent system from using 4gb modules?
02-16-2020 03:39 AM
I thought part number was HYMP151F72CP8D5-Y5, here is a pic.
I read official HP modules part numbers are 398708-061, 398708-561, and later 466463-061, I found a set of 398708-561 I could buy, but I'm still not sure it will resolve my problem.
02-16-2020 08:31 AM
4GB 4R X8 HYMP151F72CP8D5-Y5 AB-C Hynix 4GB PC2-5300 DDR2-667MHz ECC Fully Buffered CL5 240-Pin DIMM
this is a Quad Rank Memory Module <--------!!!!!!!!
the "4R" is the rank spec, you need a 4GB module that says 1R or 2R
you can not use quad and single/dual rank modules at the same time in a 6400 and a 4GB quad rank module is not compatible
you must use single/dual rank ram