Question Asus P5P43TD CPU upgrade but doesn't POST

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Couch_Potato123

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Sep 3, 2016
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Hi, recently I upgraded an intel core 2 quad q6600 SLACR to an intel core 2 quad q9550 SLB8V on this motherboard. It was working fine with the q6600 but when I placed the new cpu, the motherboard won't load into bios and doesn't turn on. I did upgrade the BIOS and tried to reset CMOS, nothing worked. I know the cpu is on the supported list so I have no clue where could have gone wrong. I also used another old cpu which was celeron e3400 and it worked, just not the quad q9550.
I know it's an old board already, found out that I had this equipment at home so I thought of reutilizing it.
Could anyone help a newbie? Thanks!

Specs:
Motherboard : Asus P5P43TD
CPU: Intel Core 2 Quad Q9550 SLB8V
Ram: 4x 4GB DDR3 1600Mhz
GPU: GTX 750 TI
PSU: 550W
Storage: SSD 512GB
 
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triplex1 said:
you will find an E5450 xeon from AliExpress, it's cheap, it's only 80 watts and it goes up more than all the others, you'll just need a mod bios to put in for it to work
Click to expand...
I do have it, I already tried it it didnt work, so i thought maybe my board didnt support e5450, so i bought the q9550 because I thought it would work since the board is compatible with it. But i was wrong.
 
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Couch_Potato123 said:
I do have it, I already tried it it didnt work, so i thought maybe my board didnt support e5450, so i bought the q9550 because I thought it would work since the board is compatible with it. But i was wrong.
Click to expand...
The same problem as q9550, the board doesnt post with the E5450 on it. I thought it was a bios problem since i needed the microcodes but even with the modded bios it didnt boot up.
 
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Couch_Potato123 said:
I appreciate the help, I think imma just give up, i just wanted to revive this old machine with a cpu upgrade. It still works with intel q6600 but not with q9550. Imma stick with q6600 and maybe find a motherboard with LGA 1151 and cpu combo.
Click to expand...
once upon a time, years ago, made a lot of these with xeon, your mb is good because it works with ddr3
 
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triplex1 said:
you will find an E5450 xeon from AliExpress, it's cheap, it's only 80 watts and it goes up more than all the others, you'll just need a mod bios to put in for it to work
Click to expand...
He should be careful of not getting fake hardware, like I did with my Q9450. Issue was not due to the PSU since the currant was delivering enough power to the parts. In the end I concluded that the CPU's IHS was probably switched that made it to not work. And now I have the Q9550, but I will be getting an E5450 this Christmas or next year.

But I fully say yes to your idea, OP should do this. I even can send a tutorial on how to do the BIOS mod by urself using MMTool (I have the Microcodes from archive.org still left)
 
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Couch_Potato123 said:
With a q6600 even modern browser lags with 100% usage. Unless i use linux. I wanted to take advantage of this gtx 750 ti .
Click to expand...
U probably were sold fake hardware. Same sh?* happened to me. I got a Q9450 from Ali, but I was able to post, but the CPU specs were messed AF. So I got refunded and got one from AliExpress from a great reputation store and it worked.

I suggest JS-XCY store and CPU Wholesale Store
 
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LuKaWin10 said:
U probably were sold fake hardware. Same sh?* happened to me. I got a Q9450 from Ali, but I was able to post, but the CPU specs were messed AF. So I got refunded and got one from AliExpress from a great reputation store and it worked.

I suggest JS-XCY store and CPU Wholesale Store
Click to expand...
What are the chances, I bought cpu twice, and both times they were not working. One xeon E5450 and one Q9550.
 
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LuKaWin10 said:
U probably were sold fake hardware. Same sh?* happened to me. I got a Q9450 from Ali, but I was able to post, but the CPU specs were messed AF. So I got refunded and got one from AliExpress from a great reputation store and it worked.

I suggest JS-XCY store and CPU Wholesale Store
Click to expand...
How do you even check if the hardware is fake? But guess what, i bought my q9550 from that exact store, JS-XCY.
 
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Couch_Potato123 said:
What are the chances, I bought cpu twice, and both times they were not working. One xeon E5450 and one Q9550.
Click to expand...
Chances tend to be high if the seller has a high review but not many bought out processors. Then those are possibly bot reviews. You might have fake hardware. Maybe clean the whole processor by brushing it with some 99% isopropyl alcohol? Or clean the socket as a last resort? It could be the CPU issue. Because I had the same thing too except for me I booted into Windows 8.1 Pro. Then after it did not work, I put my old E6750 in and everything worked flawlessly.
 
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LuKaWin10 said:
He should be careful of not getting fake hardware, like I did with my Q9450. Issue was not due to the PSU since the currant was delivering enough power to the parts. In the end I concluded that the CPU's IHS was probably switched that made it to not work. And now I have the Q9550, but I will be getting an E5450 this Christmas or next year.

But I fully say yes to your idea, OP should do this. I even can send a tutorial on how to do the BIOS mod by urself using MMTool (I have the Microcodes from archive.org still left)
Click to expand...
I did try that, but for some reason the MMTool had a weird layout on windows 10 that didnt let me add entries (hidden UI) to the cpu patch table.
 
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LuKaWin10 said:
Chances tend to be high if the seller has a high review but not many bought out processors. Then those are possibly bot reviews. You might have fake hardware. Maybe clean the whole processor by brushing it with some 99% isopropyl alcohol? Or clean the socket as a last resort? It could be the CPU issue. Because I had the same thing too except for me I booted into Windows 8.1 Pro. Then after it did not work, I put my old E6750 in and everything worked flawlessly.
Click to expand...
It must be the cpu issue, because the pc works fine with the cpu i had and old cpus for lga 775 I have at home. I find it weird why a q9550 wouldnt work on this motherboard since it is supported.
 
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