I was following this forum for quite some time and found that is very interesting.
I want to tell you all, about my PHENOM II case. After my decision to upgrade i was stuck with very little choice of AMD CPU`s. Namely there was not any 700 series, and i found 900 series to expensive and Athlon II 600 or 400 too slow. But decision was to go with Athlon 620 and heavy overclock. In time, when I was about to supply all needed parts, two questions became important and complicated. As I decide to go with strict budget for the machine i was going to by some Gigabyte AMD 785G board ( I was very satisfied with GA-MA78G-DS3H and Phenom email@example.com GHz) .
But there was`n any in that time ( early January ). So i want to go with ASUS M4A785TD-V EVO but it was sold out too. So the best MB which came handy was MSI 790GX-G65, about 20Euro more (30$US) but this was the only solution.
As I spend some time looking for MB the reserved Athlon II 620 was also sold out. As I was very eager to complete the PC, the only CPU that Fit`s the budget was Phenom II 545 (dual core 3.0 MHz, with massive 6MB L3 cache). I found very cheap 2x2GB 1333 GHz Kingston DDR3 memory. So every thing was ready except CPU. I was able to pick up 2 Phenoms II 545 and to try to unlock them. If I was unable to do so, I decide to return them to the supplier, and wait for my Athlon II 620.
Two CPU`s was manufactured at the same week 0941 Rb-C2 stepping. I was at first frustrated with this CPU`s. I was able to get POST but never go to Windows with 4 cores unlocked with any CPU. As I get little familiar with MSI Cell BIOS menu on My 790GX MB, there was possibility to unlock only one more core not two. I tried this and this worked very well on two CPU-us. So I got 3-core Phenom II CPU ( never released Phenom II 740 ) on 3 GHz. At this point I was more or less satisfied with the PC and try to find the overclocking potential with the components I already have ( Cooler, PSU, and New MSI MB). I was able very easy to get 3.4 GHz, rising FSB to 227 MHz and lowering HT ratio from 10 to 9. This way I get
CPU 3.4 GHz (15x)
HT 2027 MHz (9x)
RAM 756 MHz
with locked PCI and PCIX ratios.
Maybe the CPU was able to go faster, but my cooler is not up to the task and this was OK in my view. This was achieved with the 1.6 and 4.0 BIOS versions of the MSI 790GX-G65 MB. This Phenom II 545 was with HDX545WFK2DGI, CACYC AC 0941CPMW -OPN. The second CPU achieved the same result and both were perfectly stable after all night prime95.
I must admit I was little bit sorry, that after trying all possible settings I was still unable to unlock the fourth core which was probably defective.
Before one week or so, a came across one more Phenom II X2 545 and one Athlon II X3 435. I took them for a "ride" to try to unlock all four cores. I try first the Phenom II X2 545 CPU, with default BIOS settings and only auto ACC calibration. I don't believe my eyes when Windows booted on the first try. After this i immediately try to overclock all four cores and it was success too. I achieve the same results as for the only 3 cores enabled on the previous CPU. I run Prime 95 for 3 hours, Lynx 20 passes, and AMD OverDrive torture test as my Rig is rock stable.Please check the Screen shots.
To sumarize:MB MSI 790GX-G65 bios rev. 4.0
CPU AMD Phenom II X2 545 3.0 GHz. Ulocked to Phenom II X4 B45 3.45 GHz
Memory Kingston DDR3 1333 MHz 2x2GB @ 766 MHz/1533
HT link x9 2070 MHz
FSB 230 MHz
Default CPU vcore 1.352v
CPU OPN HDX545WFK2DGI CACYC 0940FPHW
[/B]Edited by vige - 2/7/10 at 12:27pm