IBM System x3650 M4 46
NVIDIA Quadro K600 requirements:
Maximum 128 GB system memory
NVIDIA Quadro K2000 requirements:
 No additional requirement
NVIDIA Quadro K4000, K5000, K6000 requirements:
Only drive backplanes 8x 2.5" HS HDD Kit (feature A1JX) or Plus 8x 2.5" HS HDD Assembly Kit 
with Expander (feature A1JY) can be selected
NVIDIA Tesla K20, K40c requirements:
For models with E5-2600 v2 processors. Models with E5-2600 not supported.
Second processor required
NVIDIA Grid K2 requirements:
Second processor required
When 2 GPUs selected, only drive backplanes 8x 2.5" HS HDD Kit (feature A1JX) or Plus 8x 2.5" 
HS HDD Assembly Kit with Expander (feature A1JY) can be selected