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Can any processor suit my LGA775 socket?


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#1 zack61w

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Posted 01 October 2017 - 04:24 AM

I have an outdated motherboard, its ASUS P5GC-TVM-SE/S. It has Intel Pentium D 930 processor installed with a Nvidia Geforce GTX 520. I'm thinking of replacing the processor with Core 2 Duo E8500. I heard that the processor has to match the BIOS requirement. Does the processor work fine with my motherboard as my BIOS version is 0201? 



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#2 jonuk76

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Posted 01 October 2017 - 10:09 AM

No you would need to update the BIOS to a minimum of version 0407 according to the Asus site.  https://www.asus.com/Motherboards/P5GCVM/HelpDesk_CPU/ There are limitations on this processor too - 

 

beta,beta,Due to chipset limitation, 1333FSB processors can only run at a maxium speed of 1066FSB on this motherboard.

 

Running the FSB at 1066mhz will result in the processor running at approx 4/5's of it's proper rated speed.  It's also a beta quality BIOS.

 

The Wolfdale 3M processors (Core 2 Duo E7200 ~ E7500) have a 1066mhz FSB so might be a better option.


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#3 zack61w

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Posted 01 October 2017 - 01:47 PM

No you would need to update the BIOS to a minimum of version 0407 according to the Asus site.  https://www.asus.com/Motherboards/P5GCVM/HelpDesk_CPU/ There are limitations on this processor too - 

 

beta,beta,Due to chipset limitation, 1333FSB processors can only run at a maxium speed of 1066FSB on this motherboard.

 

Running the FSB at 1066mhz will result in the processor running at approx 4/5's of it's proper rated speed.  It's also a beta quality BIOS.

 

The Wolfdale 3M processors (Core 2 Duo E7200 ~ E7500) have a 1066mhz FSB so might be a better option.

Thanks for the reply. But my motherboard is P5GC-TVM-SE you can't find this motherboard on the official site cause its an ignored motherboard. Actually my BIOS version is 0201 not even 0401. So what you say is any lga 775 processor won't run its full capacity with unmatched bios right? 



#4 Drillingmachine

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Posted 01 October 2017 - 02:18 PM

Processor frequency is FSB*multiplier. CPU has fixed multiplier so CPU meant for 1333 MHz runs lower clock speed on 1066 MHz FSB.

As Core 2 Duo E7xxx series are rated for 1066 MHz FSB, they run on full speed with 1066 FSB.

BIOS have effects on compatibility but not CPU speed in this case.

#5 jonuk76

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Posted 02 October 2017 - 12:39 AM

Thanks for the reply. But my motherboard is P5GC-TVM-SE you can't find this motherboard on the official site cause its an ignored motherboard. 

 

 

 

Sorry, that will teach me for assuming the 1st result on Google was the right link!  Weird they have boards not included on their site.  Presumably it's a model created for a large OEM rather than a retail motherboard. It makes it difficult because BIOS updates may not be available and documentation (including official CPU support lists) is not easy to find.

 

Actually my BIOS version is 0201 not even 0401. So what you say is any lga 775 processor won't run its full capacity with unmatched bios right? 

 

 

 

Not quite.  As Drillingmachine correctly states the  CPU speed is linked to the FSB speed (their speed is a multiplier of the FSB).  As motherboards based on the P45GC series of chipsets can't run at an FSB of 1333mhz, but DID support CPU's with an FSB of 1066 mhz, then it makes sense to avoid 1333 mhz FSB CPU's with these motherboards, as they won't run at full speed.  However, if a CPU is not supported by the BIOS at all then the computer may just simply not boot with the unsupported CPU.

 

If we assume (I think reasonably) that the "parent" model for the P5GC-TVM-SE is the Asus P5GC-VM, then you can see the progression of CPU support added via BIOS updates through it's lifespan.

 

At launch with the earliest BIOS versions it worked with all Pentium D's, and the initial Core 2 Duo models (Conroe & Allendale 65 nm models, E4*** and E6***, 800 mhz & 1066 mhz FSB) BIOS version 0201, dated 15/09/2007.

A small number of additional processors (Celeron & Pentium Dual Core's in the E1*** and E2*** series) was added with BIOS 0204, dated 19/10/2007

A few Wolfdale 3M (45 nm Core 2 Duo, E7*** series) processors were added in BIOS 0401, dated 23/01/2008

Most remaining Wolfdale 45 nm based Core 2 Duo and Pentium Dual Core processors added in BIOS version 0407, dated 26/09/2008

A few late models (Wolfdale based Dual Core Pentium E6***) were added in the final BIOS release 0408 dated 08/06/2010

 

So, short of getting a CPU support list for your exact motherboard along with BIOS updates, I would deduce that for best chance of getting a processor update that will work with your existing BIOS, you'd probably be best sticking to the early model (Conroe) Core 2 Duo models like the E6700.

 

While not as fast as later model C2D's like the E8500, they are still going to be in more than 100% faster than the Pentium D 930... https://www.cpubenchmark.net/compare.php?cmp[]=1128&cmp[]=1668&cmp[]=5 and they sell for pocket money on eBay...

 

Phew, that ended up being a longer and more complicated post than I intended!


Edited by jonuk76, 02 October 2017 - 12:52 AM.

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#6 MadmanRB

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Posted 02 October 2017 - 08:23 PM

In any case any processor you can get will be an improvement, the core 2 duos are still a great processor even by todays standards and are very cheap to get so there is no real loss here in getting the wrong processor.

The Pentium D really is considered intels worst processor for many and with good reason, even the often hated Pentium 4 is often held in better regard.


Edited by MadmanRB, 02 October 2017 - 08:27 PM.

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#7 zack61w

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Posted 05 October 2017 - 11:22 AM

Thanks for the support. Extra Kudos to @jonuk76.  :thumbup2:  

I've heard about BIOS modding for CPU support, I know its risky but what are your aspect of view?? 



#8 MadmanRB

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Posted 05 October 2017 - 11:58 AM

I would not mess with the BIOS, you could make the computer unbootable.


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#9 jonuk76

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Posted 05 October 2017 - 01:19 PM

If you are certain a BIOS update is supplied by Asus for your exact motherboard (model and PCB revision), and will add support for a CPU you intend to buy then a BIOS update may be worth the risk.  Honestly while it's fair to say there is a risk, I've been lucky so far in doing many, many updates over the years and not having a failure.  If Asus do not supply a BIOS update for your motherboard, then I suggest not messing with it.


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#10 zack61w

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Posted 07 October 2017 - 09:21 AM

Thanks guys, I recently found that my motherboard has FSB 1066MHz. So any best processor suggestions?  :thumbup2:



#11 jonuk76

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Posted 07 October 2017 - 10:09 AM

What is the date of your BIOS?  You can either find this in the BIOS itself, or in software like Speccy, CPU-Z etc.

 

If it's around September 2007, as per bios version 0201 on the retail P5GC-VM board, then as I wrote a few posts above I think the best choice that would likely work would be a Core 2 Duo E6700 (2.66 Ghz).  In their day, these were a $500 CPU... Now I see them for under $10 on eBay.  Much much better than a Pentium D anyway...

 

If it's significantly later, late 2008 or 2009, then it may support the Core 2 Duo E7500  which are a tad faster and sell for a similar price.


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#12 zack61w

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Posted 07 October 2017 - 12:05 PM

Yes, you're right E6700 is the best suited one as my BIOS is dated 2007. Final confusion, what really happens if I put a 45nm processor with a BIOS that supports 65nm? 



#13 jonuk76

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Posted 07 October 2017 - 01:02 PM

Best case it starts up with an "unrecognised CPU" error.  It may need manual configuration of voltage, FSB speed, multiplier etc.  More probable case is it fails to POST.


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