Tyan Thunder S2915WA2NRF-E cannot recognize 32GB of registered DDR2
I am currently building a workstation around a Tyan Thunder S2915WA2NRF-E:
S2915WA2NRF-E / 2 x Opteron 2378 / 8 x 4GB registered DDR2
EVGA Geforce 275 GTX 896GB / Crucial CT256M225 256GB SSD
Tuniq 1000W PSU
The memory I am using is of Qimonda manufacture which is included on the memory support list. I am sure, however, that the issue is not the memory itself but rather the DIMM slots. I have verified this by rotating the DDR through the various DIMM slots and, regardless of which stick I've used, the memory placed in CPU1 DIMMs 2 & 3 is not detected. I have tested this by populating each DIMM slot incrementally:
(see http://www.tyan.com/manuals/m_s2915-E_100.pdf for the board manual)
Placing a 4GB stick in each slot incrementally (until I reach 8 x 4GB) and booting into BIOS:
CPU0 DIMM3 : 4GB detected
+ CPU1 DIMM3 : still only 4GB total detected
+ CPU0 DIMM2 + CPU1 DIMM2 : only 8GB total detected
... and so on. At the point where I reach 32GB (all DIMM slots populated) the BIOS will still only detect 24GB of DDR.
Could this be an issue with the 2nd CPU on the board (through which the DIMM slots are referenced)?
There are no issues with the CPU reported on POST. I thought initially this was an issue with the motherboard however I have since purchased a replacement and still have the same problem.
Tyan support is pretty useless... anyone here have any ideas?
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