Question tyan s5396 not all ram detected

Feb 10, 2021
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Hi,

I use old server for learning purposes. Recently i decided to buy more ram so i ordered 3x4gb hp fb-dimms (i have already had one Chinese 4gb ram stick at home).

Yesterday I received that sticks and put them in server, I used slots 1,3,5,7, but when I boot, server recognize just 12288mb of ram. I chacked in the system (centos 8) and find out that it recognize 4 slots with 4gb of ram, but system uses just 12gb.

Firstly I thought that Chinese stick is bad (or not compatible with HP dimms), so I combinated it with one HP stick (2x4gb) and server surprisingly recognized all 8gb of ram (memtest passed 3 times without error)

I tested slots 1,3,5,7 works fine with 4x1gb, so it is not a problem in any of slots.

Ram needs to be installed in pairs, so even if one stick is bad, how could it recognize 12gb, wouldn't it than recognize 8gb???

Hardware:
tyan s5396 (bios 1.01i - any instructions on how to update would be helpful, i have no idea what to do with win 98 boot disk and bios file)
2x xeon e5440
ram (amaunt is a problem)
adaptec raid contorller
 
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