Re: Trying to get 3-way SLI to work
- From: Paul <nospam@xxxxxxxxxx>
- Date: Sun, 22 Feb 2009 23:06:41 -0500
jbrandonbbx@xxxxxxxxx wrote:
Now, if I use an Xbitlabs power number, the card weighs in
at 160.8W (depends on clock rate). Three of them would be
480W, or 12V @ 40A. The non-3D mode power would be much
lower, so it shouldn't be a power issue at startup.
http://www.xbitlabs.com/articles/video/display/evga-geforce-gtx285ssc...
There are at least three Enermax products with your product
name. I would have expected the 12V @ 70A total for the
"small one", would be enough.
It is the Revolution 85Have you tried one card, then two cards, then three ?
What happens then ? Have you tried two-way SLI with
the two cards ? Then rotate out one of the cards, and
test with the third card, to see whether that works ?
I can't even get to post with one card now, and I tried with a
different one than the 285 (an ATI card).
If you cannot get to POST, your next steps would be
1) Beep tests. With no video present, the computer case
speaker should beep. A beep indicates BIOS code is
being executed. If the board won't beep, then
perhaps it isn't getting very far into the BIOS.
You can do the same beep style tests, by removing the RAM.
2) There should be a different beep pattern for missing
RAM, than for video. You can use that difference, to see
if a single stick of RAM is working or not. (I.e. Plug in
a single stick, then see if the "bad RAM" beep pattern changes
to "missing video". That tells you the RAM passed a
simple test in the BIOS.)
3) If there is still no joy, you can clear the CMOS, with
the power cord unplugged. Consult the manual for the
exact procedure. It should involve a jumper with a name
like CLRTC. If it works, and you were to get into the BIOS,
then the Real Time Clock would also get cleared to an
earlier default time of day.
4) Could the BIOS be corrupted ? It could, but it would be
hard to understand why. There have been boards with Nvidia
chipsets that were notorious for bricking. But in a quick
scan of the vip.asus.com forum, I don't see any sign of that.
This particular motherboard discussion group is mostly noise.
I couldn't see any pattern to what is going on.
http://vip.asus.com/forum/topic.aspx?elitepost=0&SLanguage=en-us&board_id=1&model=P5N-T Deluxe
The motherboard has a three year warranty. You could return it
under warranty. Then, go out and buy another motherboard, while
you're waiting. Where you go next, in terms of purchases, is the
big question. Does Nvidia have a trustworthy chipset ?
Some Nvidia chipsets have been known to blow PCI Express
slot interfaces. But I would have expected to still be able
to POST, assuming you can find an interface that works. I
use an old FX5200 PCI video card, when all else seems to be
failing. It's pretty hard to kill those.
When the repaired motherboard comes back, you can sell it,
or keep it as a spare (doorstop).
One of the problems with the new stuff, is finding enough
review articles to even get a grasp on what you're getting.
For example, this is a socket change to LGA1366, and
motherboard makers can get a license to run SLI on an
Intel X58 chipset. This particular board uses an Nforce 200.
I cannot find a block diagram, showing how it is connected.
The X58 can split into four x8 PCI Express 2.0 interfaces,
so I don't see where the big win is with the Nforce 200.
A block diagram would have made things clearer. PCI Express
lanes don't "multiply". The X58 only has 36 lanes total,
basically 16+16+4. If an Nforce 200 takes a 16 group, and
makes 16+16 from it, the bandwidth available is still limited
by the input, as 16 lanes. So while adding the Nforce 200
allows more slots to be wired up, it doesn't change the
grand total of 36 lanes on the Northbridge (and a few x1's
for motherboard peripherals on the Southbridge).
http://www.asus.com/products.aspx?l1=3&l2=179&l3=815&l4=0&model=2697&modelmenu=1
"Multi-GPU Support
Supports NVIDIA 2-Way and 3-Way SLI techonology
Supports ATI CrossFireX technology, up to Quad CrossFireX
HTH,
Paul
.
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