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.