Solved Looking for LGA 775 replacement MoBo

Xfx79u / Xfx nforce 790i ultra 3-w...
December 13, 2011 at 12:41:39
Specs: Windows Vista 64 bit(SP2), Intel Q9650/4*2GB 1600mhz Corsair XMS3
Ok so I have 8GB of 1600MHz RAM and a Radeon HD 5970, and I would very much like it if my motherboard would support both of these. I have a 790i ultra that just crapped out (and it's out of warranty) so I'm on the market for a replacement. I really don't want to have to get a new CPU and MoBo but I'm open to any advice. I would normally look for this type of thing by myself, but it seems like high-end (i.e. supporting 4 sticks of DDR3 and a real card) 775 MoBos are hard to come by now.

Thank you for the help.


See More: Looking for LGA 775 replacement MoBo

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✔ Best Answer
December 13, 2011 at 21:42:48
Okay, so your response 6 link to your previous topic provides a lot more info about your problem with your mboard.

The only thing you didn't mention trying is a different power supply.
Do you have another computer you can borrow a power supply from, or can you borrow one from a friend's computer, that has enough wattage capacity ?
.....

It could be the mboard has failing electrolytic capacitors.

Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

What to look for, mboard symptoms, example pictures:
http://www.badcaps.net/pages.php?vid=5
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
http://www.badcaps.net/

Pictures of blown capacitors, other components, power supplies, fried Athlon cpus, etc.:
http://www.halfdone.com/Personal/Jo...
.....

Fingers said....

"I checked 3 sites that sell quality new components at reasonable prices and all three only show boards for socket 775 with G41 chipsets which do not support ddr3 1600, only up to 1333"

The DDR3 1600 spec itself is backwards compatible with the DDR3 1300 spec. However, that's not the only thing that determines whether it will be compatible with a mboard that supports max DDR3 1300 specs.
The DDR1600 ram may work fine at 1300 mhz, it may not.
Whether your cpu needs the ram to run at 1600mhz depends on which cpu you have.



#1
December 13, 2011 at 14:22:05
I did a Google search for that board and found lots of them, especially on Ebay.

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#2
December 13, 2011 at 14:39:29
"...I have a 790i ultra that just crapped out..."


How did you come to that conclusion ?
It's not likely there's anything wrong with the mboard, unless you did something that damaged it, or some external event such as power surges or spikes caused by a a power failure event damaged it.

E.g. It's much more common for a failing power supply to cause you a problem.

HD 5970 System Requirements

■650 Watt or greater power supply one 75W 6-pin and one 150W 8-pin PCI Express® power connectors recommended (850 Watt with two 75W 6-pin and two 150W 8-pin connectors for ATI CrossFireX™ technology in dual mode)
■Certified power supplies are recommended. Refer to http://support.amd.com/us/certified... for a list of certified products

If your power supply doesn't have at least 650 watts capacity, it's likely it is failing.



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#3
December 13, 2011 at 16:58:45
Check for the ASUS P5K-VM. It is a nice MB.

Tek Ideas Unlimited


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Related Solutions

#4
December 13, 2011 at 17:57:11
@grasshopper
I guess ill check that out.
@tubesandwires I have an 850w Antec PSU I'm solid there. The MoBo won't make it past the post screen.
@agalpha
thanks.

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#5
December 13, 2011 at 18:10:57
"The MoBo won't make it past the post screen."

That's a rather sparse amount of info, and on it's own doesn't necessarily indicate there's anything wrong with the mboard.
Could you supply more info ?


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#6
December 13, 2011 at 18:21:51
http://www.computing.net/answers/ha...

I have done a lot of troubleshooting and came to that conclusion. This is much more in depth.


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#7
December 13, 2011 at 20:24:54
If you can get into your BIOS set up, then try a start up repair form install disk.

I checked 3 sites that sell quality new components at reasonable prices and all three only show boards for socket 775 with G41 chipsets which do not support ddr3 1600, only up to 1333. You might have to pay more or look for used if you do need the board.

Another choice might be get a socket 1155 board and a second generation i5, maybe a 2500K if you overclock, but you will also have to go with Windows 7 64bit if you get anything but a direct replacement for the same board.

You have to be a little bit crazy to keep you from going insane.


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#8
December 13, 2011 at 21:39:52
It is completely unresponsive at the post screen. I can't boot or get into bios setup.

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#9
December 13, 2011 at 21:42:48
✔ Best Answer
Okay, so your response 6 link to your previous topic provides a lot more info about your problem with your mboard.

The only thing you didn't mention trying is a different power supply.
Do you have another computer you can borrow a power supply from, or can you borrow one from a friend's computer, that has enough wattage capacity ?
.....

It could be the mboard has failing electrolytic capacitors.

Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

What to look for, mboard symptoms, example pictures:
http://www.badcaps.net/pages.php?vid=5
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
http://www.badcaps.net/

Pictures of blown capacitors, other components, power supplies, fried Athlon cpus, etc.:
http://www.halfdone.com/Personal/Jo...
.....

Fingers said....

"I checked 3 sites that sell quality new components at reasonable prices and all three only show boards for socket 775 with G41 chipsets which do not support ddr3 1600, only up to 1333"

The DDR3 1600 spec itself is backwards compatible with the DDR3 1300 spec. However, that's not the only thing that determines whether it will be compatible with a mboard that supports max DDR3 1300 specs.
The DDR1600 ram may work fine at 1300 mhz, it may not.
Whether your cpu needs the ram to run at 1600mhz depends on which cpu you have.


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