Hello all, I just got XFX's 790i board, I put in a Q9300 Yorkfield, 2 gigs of 1300 DDR3 memory and a 8800GT video card, with a 650 Watt power supply. When I start it up, I go into the bios, then it powers off without any warning. It loses power after at best nearly a minute. I looked in the manual and it claims it requires a 1000Watt power supply, which I find hard to believe, I can't believe the components for this system would require that much power? I don't even have a harddrive or a optical drive plugged in to be siphoning off power from the board and video card?
That 1000 Watt requirement is for triple SLI. For a dual SLI, the manual with my 790i Ultra board says 500 Watt minimum and for a single card, it lists a 350 Watt minimum.
My board is an EVGA, but I believe all the early 790 boards are just reference designs, meaning they should be essentially identical.
I've got an X3360, (essentially a Q9550), 4 gig of DDR3-1333 memory, with dual 8800GTX OC cards driving 24 inch and 19 inch LCDs, 4 hard drives, one of them being a 10,000 RPM unit, two DVD burners, a TV tuner and 5 case fans all running with a 700 Watt power supply.
It all seems to run well....., but the room does get noticably a little warmer after it's been running for a while.
The only problem I had with the power supply was having enough power connectors with the Thermaltake power supply I bought.
> Hello all, I just got XFX's 790i board, I put in a Q9300 Yorkfield, 2 gigs of 1300 DDR3 memory and a 8800GT video card, with a 650 Watt power supply. When I start it up, I go into the bios, then it powers off without any warning. It loses power after at best nearly a minute.
If you have a stock Intel HSF, then read and heed this:
Your CPU may be overheating because the stock HSF
is not seated properly: if so, there is not enough contact pressure
between the HSF and the CPU's heat spreader.
BEST SOLUTION is an aftermarket HSF with a proper backing plate
e.g. ASUS V-60 Vapo Bearing (or comparable unit with backing plate).
> If I understand this specifications correctly it means > anything that is past 1333MHz needs to be EPP 2.0 compatible.
I don't think so: my understanding is that EPP is a lot more advanced than SPD:
EPP does automatic tuning, but
non-EPP memory will work,
chiefly because the memory controller
is in the Northbridge, and the DRAM bus
can run at different frequencies than
the CPU bus.
Thus, there can be, and often, is a non-synchronous FSB:DRAM ratio,
e.g. 1:2, 2:3 and so on.
Thus, you don't need DDR2-800 or faster
to achieve a 1:1 FSB:DRAM ratio with a
1,333 MHz Front Side Bus.
Just remember that the FSB for Intel CPUs
is "quad-pumped" (4 data transfers per clock tick) and
DDRx RAM is "double data rate" (2 transfers per clock tick).
However, if you want high-end memory to effectively "self-optimize" then an EPP-compatible chipset must be used with EPP memory.
Sincerely yours,
/s/ Paul Andrew Mitchell, Inventor and
Webmaster, Supreme Law Library
http://www.supremelaw.org/
All Rights Reserved without Prejudice
Message edited by supremelaw on 05-06-2008 at 07:24:46 PM
If you're referring to the DRAM clock, then in the Specifications above, see:
Memory Standard
DDR3 2000(OC)/1800(OC)/1333
Support DDR3 up to 2000 MHz with EPP 2.0 Memory
Although I don't have any experience with that motherboard
or chipset, you should be able to set memory timings and
DRAM clock speeds manually, if you're not happy with the
timings & speed chosen by the EPP feature.
To be safe, I would buy DDR3 with EPP support,
in order to have more available options.
I'm aware of Corsair DDR3 which does not have EPP support.
I hope this helps.
Sincerely yours,
/s/ Paul Andrew Mitchell, Inventor and
Webmaster, Supreme Law Library
http://www.supremelaw.org/
