One of the riser cables is CR388 not sure if there are 2 or only 1 riser power cable. Some say the 690 risers are NOT correct for the 7400.What I can say for sure is that there are 4 boards and 2 risers each facing the opposite way hense the 3 & 4 designation on some risers.
DELL F817F Precision 690 Workstation Memory Riser Card F817F F816F
Dell JF806 Precision 690 Memory Dimm Riser Expansion Board Card JF806 H9376 G9460
Dell Precision 690 Memory Riser Boards JF807 M9008
Dell TY853 Precision 690 Memory Riser Module TY853 NN378 NN383
Dell Precision 690 and T7400 Memory Riser 3 & 4 Board TY857
YMMV This is an educated guess.
ChrisM might verify this.
What you want is:
DELL CR388 ASSY,CBL,PWR,MEM,PWS,T7400
DELL Assembly,Shroud,Riser,Dozer T7400 YR128
T7400 Memory Riser Board F817F
T7400 Memory Riser Board G327F
Dell Precision WorkStation T7400 (FB DDR2-667MHz) Memory
The SLI BRIDGE IS Dell Part Number: MJ247 0MJ247 CN-0MJ247
Compatible Part Number: 180-10219-0000-A01
Compatible Models: Dell Dimension XPS 600 Precision T7400 690 XPS 700 710 720
JF806 and JF807 are bolted back to back and it appears to me that the riser power cable is only on one side just like on the T7400 risers.
Look at pic below.
The riser power cables are attached to the large P24 connector from the power supply, using a CN-0CR388 cable which splits it into another two memory riser connector cables. Also, the 7400 riser version has a different memory fan assembly. Its not a simple just plug in risers and use it install.
|Maximum Memory||128GB (with 4 Memory Risers)/64GB (standard)|
|Memory Slots||16 Sockets (4 Sockets (2 banks of 2) per Riser)/8 Sockets (4 banks of 2) (standard)|
|non-removable base memory||0MB|
Machine name: Dell Precision WorkStation T7400
The four memory riser cards are connected together in sets of two. Do not attempt to disconnect the memory riser cards from each other. Each memory riser card is numbered in the upper left hand corner. These numbers indicate which DIMM slot on the system board each riser card must be inserted into. Only the DIMM_1-4 slots (the slots with the white securing clips) on the system board can be used with the riser cards. The other slots (DIMM_5-8) must be left vacant.