Help needed with old Dell optiplex GX280

[sneakyprawn]

Hi,

I have an old Dell OptiPlex GX280 SFF, I have identified the chipset as the Intel 915GV

On the supported CPU's it says I can run upto 3.8ghz P4 HT 5xx and 3.6ghz 6xx

I am currently running a 651 3.4ghz cedar mill core but when I install a 661 3.6ghz the machine does a self test and I am left with the power button showing amber and the CPU cooler is running, this CPU was SL96H (C1)

I have tried another 661 3.6ghz CPU SL94V (B1) I get the same issue, if I put the 3.4ghz 651 back in SL9KE (D0) the machine is fine.

Everything tells me I can runs a 3.6ghz cedar mill or a 3.8ghz Prescott, what is the problem, is it the stepping code ???

Prev is was running a P4 HT 3.2ghz 640.

I am a bit confused, now I understand the cpu I am using now uses on 65w due to the stepping code, the P4 HT 3.2ghz 640 is 84w, could the issue and I know its only 1w be that the two 661's I have tried with 85w is to much for the machine as the vid card I am using does munch power.

I might try removing the vid card to see if this make a diff.

Any advice on this would be great, thank you.

 

[OCGuy]

BIOS update?

 

[Virgorising]

Hi,

I have an old Dell OptiPlex GX280 SFF, I have identified the chipset as the Intel 915GV

On the supported CPU's it says I can run upto 3.8ghz P4 HT 5xx and 3.6ghz 6xx

I am currently running a 651 3.4ghz cedar mill core but when I install a 661 3.6ghz the machine does a self test and I am left with the power button showing amber and the CPU cooler is running, this CPU was SL96H (C1)

I have tried another 661 3.6ghz CPU SL94V (B1) I get the same issue, if I put the 3.4ghz 651 back in SL9KE (D0) the machine is fine.

Everything tells me I can runs a 3.6ghz cedar mill or a 3.8ghz Prescott, what is the problem, is it the stepping code ???

Prev is was running a P4 HT 3.2ghz 640.

I am a bit confused, now I understand the cpu I am using now uses on 65w due to the stepping code, the P4 HT 3.2ghz 640 is 84w, could the issue and I know its only 1w be that the two 661's I have tried with 85w is to much for the machine as the vid card I am using does munch power.

I might try removing the vid card to see if this make a diff.

Any advice on this would be great, thank you.

I just gave away my oldest Optiplex, my GX260 MT (not SFF) with the famous clam tower.

I will delve, but my take is you are being too ambitious with that board forget, the stock PSU in yr SFF system re the GPU.

 

[SolMiester]

A07 adds more CPU support, latest is A08, what version are you running OP?..

http://www.dell.com/support/drivers...plex-gx280?driverId=R113394&fileId=2731111524

 

[Virgorising]

CPU Upgrade Options

• The Optiplex GX280 supports Intel's LGA 775 CPU socket format. At the time of purchase, consumers could opt for the more powerful Intel Pentium 4 540 CPU operating at 3.2 GHz with a 1 MB Level 2 cache. If you are seeking to upgrade your Optiplex GX280's CPU, you can change your current CPU to any Intel processor using the LGA 775 socket. When upgrading to a more powerful CPU, you should also consider a new heat sink and fan to keep it cool.
  
  

Edit: http://www.ebay.com/bhp/lga-775-cpu-quad-core

The Cedar Mill U R having trouble with is single core? It seems you can do better with this older system!

http://www.best-price.com/search/la...essors&mob=0&gclid=CNG3ztmS8roCFUlp7AodGDUA2Q
​

 

[Virgorising]

BIOS update?

Excellent thought.

 

[VirtualLarry]

Most likely PSU needs an upgrade, or BIOS needs updating.

Have you tried clearing the CMOS after installing the new CPU(s)?

 

[sneakyprawn]

HI all, thanks for all the info, I have the A08 bios, not cleared the CMOS, there is no jumper to do this, so I guess its the old remove the CMOS battery and from mains supply for 5 mins will have to do. Will update later, again thanks for input

 

[Virgorising]

HI all, thanks for all the info, I have the A08 bios, not cleared the CMOS, there is no jumper to do this, so I guess its the old remove the CMOS battery and from mains supply for 5 mins will have to do. Will update later, again thanks for input

Excellent! Thing about Optis, even the SFFs....they are engineered well and built to last. I speak from first hand experience with, now 3, tho only the big MTs.

Enjoy!