Re: TK025 Dual Graphics Riser for T7400 in Dell Precision 690 ?
I purchased an TK0025 SLI riser and related install kit (w/ fan, card bracket and pan (card cage)) originally designed for a 690 and it fit the T7400 fine, so my experience is that the SLI riser parts for 690/7400 are interchangeable.
All of these parts are available on eBay -as are memory expansion riser kits.
I ordered two 1GB EVGA Geforce 560 (not ti) cards for SLI. These each require 2x 6pin power sources so I am adding a couple of PCI graphics power splitters to connectosr P5 and P18.
What I don't like about the SLI riser card is that you lose your PCI/PCIe slots if your are using SLI.
If you plan to use dual SLI with the T7400 this leaves you with three remaining PCI-X slots.
I hoped to use the PCI Express x8 card slot, (wired as x4) for a Perc 6i card.
More bad news is that while you can find PCI-X raid controllers, I haven't been able to find a PCI-X USB 3.0 controller.
-You have to be careful when looking for such a card as MANY PCI-Express cards are misrepresented as PCI-X and sales people listing these items online do not know there is a difference between PCIe and PCI-X cards.
There are PCI USB 3.0 controller cards, but the PCI-X bus speed drops to the speed of the lowest card on the bus so if you pop a PCI card into your PCI-X bus it could radically affect the performance of other PCI-X cards.
I fear the same would also be true of PCI-X to PCIe riser (adapter) cards. (that a PCIe card plugged into a PCI-X adapter would run at PCI speeds). This wouldn't be an issue if the PCI-X slots have two or more different busses.
Does anyone know if all three PCI-X slots share the same bus? (pardon me if this has been answered elsewhere in the forums).
btw: Happy new year and thanks to all the great contributions to this thread.