Product guide

IBM System x3500 M4 36
Power supplies and redundant cooling
The server supports up to two redundant power supplies. Standard models come with one or two power
supplies (model dependent). The server also comes standard with either two (for models with one
processor installed) or three (for models with two processors installed) simple swap cooling fans. Optional
upgrade is available to provide N+N cooling redundancy. The following table lists the power supplies and
redundant cooling upgrade option.
Table 16. Power supplies
Part
number
Feature
code
Description Maximum
supported
Standard models
where used
94Y5975 A22M IBM System x 550W High Efficiency Platinum AC
Power Supply
2 -
94Y5974 A1G8 IBM System x 750W High Efficiency Platinum AC
Power Supply
2 A2x, B2x, C2x, C4x,
D2x, F2x
94Y5973 A1G7 IBM System x 900W High Efficiency Platinum AC
Power Supply
2 G2x, H2x, J2x
81Y7007 A1G2 Redundant Cooling Upgrade Kit 1 -
An AC power supply ships standard without a line cord, it must be purchased separately. The redundant
cooling kit contains three simple swap fans. Certain rules apply to the selection of power supply, these
rules are listed in Table 17. Table 17 uses the following conventions:
A grey cell means that the server can be filled with drives, GPUs, processors and DIMMs up to the

maximum number according to server specifications.
A yellow cell means that the maximum number of drives, GPUs, processors or DIMMs that the server

can hold is fewer than the total number listed in server specifications.
Table 17. Configuration rules based on power supply used (PSU = power supply unit, NS = no support)
Max. drive qty Max. DIMM qty supportedPower
supply
PSU
qty
PSU
red.*
2.5" 3.5"
Intermixing
2.5" + 3.5"
Max.
GPU
qty
CPU
support
UDIMM RDIMM LRDIMM
1 No 8 8 No support NS Max. 95 W 16 16 SR or DR
(NS for QR)
NS550 W
2 Yes 8 8 No support NS Max. 95 W 16 16 SR or DR
(NS for QR)
NS
1 No 16 8 8 + 8 drives NS All (135 W) 16 24 16750 W
2 Yes 16 8 8 + 8 drives NS All (135 W) 16 24 16
1 No 32 8 8 + 8 drives NS All (135 W) 16 24 16
1 No 8 8 No support 1 GPU All (135 W) 16 24 16
1 No 16 8 8 + 8 drives NS All (135 W) 16 24 24
2 Yes 32 8 8 + 8 drives NS All (135 W) 16 24 16
2 Yes 8 8 No support 1 GPU All (135 W) 16 24 16
2 Yes 16 8 8 + 8 drives NS All (135 W) 16 24 24
900 W
2 No 32 8 8 + 8 drives 2 GPUs All (135 W) 16 24 24
* PSU redundancy