Which Motherboard for Quad Q6600, 8gigs & 2 x SLi 8800gtx

mccltd

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Hi,

I have built a machine based on the Asus Striker board with 8gigs ram and daul SLi but it is so unstable.
I have now read many bad reviews on this striker board so am going to replace it.(wish I researched it beforehand)

What board can you recommend that would do the job?

Q6600, 4 x 2gig chips, 2 x 768meg 8800gtx cards, 1200watt PSU.

Thanks,

Dave.
 

Hatman

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Mate if its unstablle it may well be your power supply.

You'd need atleast a 700w power supply for all taht but Id recomend a 800watt+ supply tahts been certified with crossfire/sli.
 

deceneu

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I agree with hatman, the power supply is the most likely problem
although 800 watts might not be necesarry, a very good 650 watts should do it, but take a good look to what you are buying, you will nead a lot, A LOT , of amps.

seasonics are good, also true power trio from antec is good, ( made by seasonic )
 
Ummm, I thought the OP said he has 1200 watts...

The 8800 GTX SLI needs about 56A on the +12V rails.

OP: what kind of PSU do you have?

I've heard of some issues with Striker and OCZ memory, could that be it?
 

mccltd

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Hi,

Using the thermaltake 1200watt so that should be fine.
We were suning OCZ, then we tried aeneon now we are on buffalo.
But now it wont power up with any of them, the LCD on the back gives scrambled data.

We have an evga coming in tomorrow so will give that a try.
 

Hatman

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I see that now sorry.

But still the motherboard shouldnt be the problem.. a high end motherboard like that is meant for high end parts like yours lol.
 

pmr

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Ummm, I thought the OP said he has 1200 watts...

The 8800 GTX SLI needs about 56A on the +12V rails.

OP: what kind of PSU do you have?

I've heard of some issues with Striker and OCZ memory, could that be it?

You should be high when you wrote this: "The 8800 GTX SLI needs about 56A on the +12V rails."
That would be 672W just for the cards- 1GTX needing 336W???
A system with a QX6700, two 8800GTX, 2Gb of ram and several disks and fans tops at 470 watts... 40Amps will hold the entire system.

@ the op. Grab any other 680i, maybe the Asus P5N32-E SLI, the Gigabyte DQ6 or the EVGA 122-CK-NF68. The DQ6 may be the worst option when adding some cpu cooler, just because of the back cooling it has embedded.

Why do you need 8Gb of ram?
 
You should be high when you wrote this: "The 8800 GTX SLI needs about 56A on the +12V rails."
That would be 672W just for the cards- 1GTX needing 336W???
A system with a QX6700, two 8800GTX, 2Gb of ram and several disks and fans tops at 470 watts... 40Amps will hold the entire system.

Hey, pot is legal in Canada. I'm not using though :p :p

I got that 56A (OK, it was "52A to 56A") from mpilchfamily in some older thread. I'm not an expert in PSUs but I'm excellent at cutting and pasting and I saved that one because I wanted an SLI myself.

And yes, 336W is close to what a 8800 GTX uses under load. Look at this:

http://www.anandtech.com/printarticle.aspx?i=2873

They got a few flavors of the GTX and they turned out to use between 277W and 301W. Can't say I like it but I trust Anandtech.

http://images.anandtech.com/graphs/8800 roundup nov06_111206101147/13559.png

Now you got me wondering. I can trust Anandtech, right?
 

pmr

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I'm not English nor American, but take a look at what you wrote:"The 8800 GTX SLI needs about 56A on the +12V rails."

It should be:The full system with 2 8800gtx in sli needs about 56A.

56A is what may be needed to a psu to output, not only in the 12V rails. 40A in the 12V is enough, that's about 480W plus the 3.3 and 5 rails to feed all the system.

Was I clear? I hope. Sometimes I can't express myself because my English is a little basic :oops:
 

speed4life

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I would go with the EVGA 680i T1 board. I have that now paired with my E6600 running solid at 3.7Ghz. Just waiting for July 22nd like everyone else. Then I will grab me a Q6600 and see what it can do. I also have the Asus P5WDH Deluxe and this EVGA board overclocks sooo much better than my Asus.


Motherboard: EVGA T1
CPU: E6600 L646G494 @ 3.7Ghz. 1:1 Ratio Linked & Synced Voltage 1.44 Load Temp 45c
Idle Temp. 25c
SPP:1.45volts, MCP: 1.50volts
Memory: Mushkin PC2 8000 4-5-4-11, 2T Voltage 2.1
Swiftech Water Cooling H20-220
Video: One EVGA 8800GTS 320MB
Power Supply: Silverstone 750W
OS: XP Pro
 

NaomiHIkaru

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Well the wattage on a power supply doesn't necessarily mean that its a good power supply (although i don't think lower brands make over 850's, for now). What matters are three points for me 1) efficientcy 2)wattage) 3)amperage.
First your power supply has to be efficient, if not well your 850 watt power supply could may as wel be drawing another 1000 watts out of your wall socket. Wattage has to cover all your components, there are some calculators out there to figure this out, but for 2 8800GTX yeah 850 or more is needed. Amps, each 8800GTX requires high amps on a single rail i.e. you have 4 raills each with 36 amps, you should be ok(assuming each pcie connector has its own rail). As for deceneu, Antec is second tier, Seasonic is lower first tier. If you want a really good power supply go with Silverstone, PC Power and Cooling, or FSP. Those are the top, and mostly expensive. My cousin went through 2 Antecs, each that were suposed to be excellent. Antec has been a little skimpy on their quality control, as most companies. Wonder if its a trend? And as speed4life said as well, make sure your RAM is compatiable with your motherboard, there have been known issues with that on the ASUS boards. Hope you get it working!
 
Thanks!

Don't worry about your English. It's much better than that of our IT admin where I work. for example. :p If you ever decide to move to Canada you won't have any problem with the language. BTW, the newspapers are complaining that we need more IT guys here...

Yeah, I meant 56A for the whole system, as in "the 8800 GTX SLI computer".

So, how's 56A for a Q6600 with three or four 500 GB hard disks and a DVD burner and a TV tuner and a sound card and two 8800 GTX cards?? Is it way too much, is it reasonable, is it too little?
 
I'm assuming we're using Vista 64 bit on this beast since it has 8 friggin' gigs of ram.

Me too. I believe XP Home is limited to 2GB, XP Pro to 4 GB (but you only get to use 3.2 GB or so). Here are Vista's limits:

Windows Vista Edition 32-bit 64-bit
Windows Vista Ultimate 4 GB 128 GB
Windows Vista Enterprise 4 GB 128 GB
Windows Vista Business 4 GB 128 GB
Windows Vista Home Premium 4 GB 16 GB
Windows Vista Home Basic 4 GB 8 GB
Windows Vista Starter 1 GB N/A

Could the instability be a driver issue? How about installing XP to see if that works properly?
 

mccltd

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Yes it's going to have Vista Ultimate 64 on it.

I have the Evga board arriving today so I will put that in and see what I get.
Its the new A1 board so I have been told that apparently has been developed to fix all the problems found on other 680i boards and quad cores.
 

pmr

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Thanks!

Don't worry about your English. It's much better than that of our IT admin where I work. for example. :p If you ever decide to move to Canada you won't have any problem with the language. BTW, the newspapers are complaining that we need more IT guys here...

Yeah, I meant 56A for the whole system, as in "the 8800 GTX SLI computer".

So, how's 56A for a Q6600 with three or four 500 GB hard disks and a DVD burner and a TV tuner and a sound card and two 8800 GTX cards?? Is it way too much, is it reasonable, is it too little?

Well, It's pretty simple. Take a look at these links:

http://www.extreme.outervision.com/psucalculatorlite.jsp

http://forumz.tomshardware.com/hardware/PSU-101-102-ftopict198276.html

http://www.powerstream.com/Amps-Watts.htm
 
Ouch! I used the first link and I got 967W for a PC with one GTX and 1100W for a PC with two of them. OK, I went nuts, selected QX6800 and 4 disks and a few other things, but I didn't even include watercooling or overclocking. That sounds scary...

I found another review of the 8800 GTX at xbitlabs, and they showed the 8800 GTX consuming 70W at idle and 121W at full load. That's much more like your numbers, and it matches the Extreme Power Calculator's result (1100-967=133, so they're saying one GTX on full load needs 133W). Maybe anandtech screwed up and those numbers they showed (300W or so per card) were not true.
 

pmr

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Ouch! I used the first link and I got 967W for a PC with one GTX and 1100W for a PC with two of them. OK, I went nuts, selected QX6800 and 4 disks and a few other things, but I didn't even include watercooling or overclocking. That sounds scary...

I found another review of the 8800 GTX at xbitlabs, and they showed the 8800 GTX consuming 70W at idle and 121W at full load. That's much more like your numbers, and it matches the Extreme Power Calculator's result (1100-967=133, so they're saying one GTX on full load needs 133W). Maybe anandtech screwed up and those numbers they showed (300W or so per card) were not true.

you did something wrong. did you choose single processor? it's a single cpu no matter how many cores it has...

A single qx6700 with 2GTX, 5 hdd, 2x120mm fans, 4 sticks of ram, a soundcard and a dvd gives me 564Watts. read everything carefully otherwise you'll give bad advices to everyone...
 
Right, I had selected quad processor indeed, it should have been "single processor". The numbers I got the first time were for a machine with 4 QX6800 CPUs :oops:

Nice, now it's down to 839W for something really nice with QX6800 and 4 disks and two 8800 GTX cards, even with 20% allowance for capacitor aging. Thank you very much. I think I'll get myself a Thermaltake Toughpower 850W, that should do it.

OP: sorry for hijacking the thread. I promise I'll stop now. Anyway, it looks like your PSU is good enough and more. Let us know if the A1 fixes it. Good luck!
 

easyg

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I'm assuming we're using Vista 64 bit on this beast since it has 8 friggin' gigs of ram.

Me too. I believe XP Home is limited to 2GB, XP Pro to 4 GB (but you only get to use 3.2 GB or so). Here are Vista's limits:

Windows Vista Edition 32-bit 64-bit
Windows Vista Ultimate 4 GB 128 GB
Windows Vista Enterprise 4 GB 128 GB
Windows Vista Business 4 GB 128 GB
Windows Vista Home Premium 4 GB 16 GB
Windows Vista Home Basic 4 GB 8 GB
Windows Vista Starter 1 GB N/A

Could the instability be a driver issue? How about installing XP to see if that works properly?

Hi there. Actually, I think the maximum amt of physical address memory you can have with any 32-bit system is 4GB. VRAM counts towards that total, which is why for instance a guy with 4 x 1GB sticks, a GTX8800 and 32bit OS will appear to have approximately 3.2 GB RAM.

It's not that the system is capped at 3.2 GB, but rather that VRAM is occupying a sizeable chunk of the total physical address memory the system is capable of recognizing.
 

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