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Precision T7400 Workstation: Memory Riser Boards
I am looking to add 64GB of ram with 16x4GB sticks. I understand I need the riser boards to do so which I don't have yet. I noticed that the riser boards are labeled Riser_1, Riser_2, Riser_3, Riser_4.
Locally there are Riser_3 and Riser_4 boards. Can I use these or do I need Riser_1, Riser_2 boards?
speedstep
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November 4th, 2015 11:00
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.
http://www.ascendtech.us/search.aspx?s=Precision+Memory+Riser
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.
Machine name: Dell Precision WorkStation T7400
CPU options: Intel Xeon
Chipset: Intel 5400 Chipset
Memory Speed options: PC2-5300 DDR2-667 240pin Fully Buffered SDRAM DIMM
Special notes: FB-DIMM Memory Risers are installed in the first four standard memory sockets only. Additional standard memory sockets then become unusable.
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.
joedella
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November 9th, 2015 18:00
Wow, thank you for al the great info and the link. I'm going to have to study and re-read it several more times to make sure I grasp everything correctly. Would be nice if ChrisM would see the post and maybe verify a few things as well.
I plan on using 16 4GB Ram sticks for a total of 64GB
speedstep
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November 10th, 2015 07:00
There are other "things" i didnt list. There is a Ram Cage and Fan. No Idea what the part numbers are.
Grasshopper1966
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November 22nd, 2015 12:00
I would suggest referring to the Users Guide which is downloadable in PDF format. Starting on page 172, the guide gives you the down-low. I'm having trouble getting my system to "see" the 32GB I have installed. I may need a BIOS flash or something. I believe you DO NEED all four riser boards to be successful. I think I'm going to take mine to a tech guy locally... there's just something I'm missing... If anyone can help ME I'd appreciate the input...
Rogspaugh
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June 21st, 2016 20:00
You need all four boards.
arby19
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June 26th, 2017 02:00
What did you find was missing? I'm getting ready to do the same thing now.
arby19
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June 26th, 2017 03:00
Did you ever find out about the RAM cage and fan? Did you have to use it? I'm wondering whether the DELL Assembly,Shroud,Riser,Dozer T7400 YR128 is even related to this. It appears to be just for the card section of the machine.
speedstep
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June 30th, 2017 09:00
Dell-Precision-690-T7400-Riser-Card-Assembly-Accessory-Kit-TH757.html