B2 rev K10 CPUs feature L3 cache miss flaw
AMD WILL ONLY LAUNCH the Phenom 9500 and 9600. Even though the channel already got its hands on the Phenom 9700 (2.4 GHz) part, it will have to be pulled off from the shelves.
In a weird deja-vu, it turns out that the company found an errata in the TLB (Transition Lookaside Buffer), just like Intel did earlier this year with complete Core marchitecture. However, unlike Intel, that has a micro-code update function in all of its CPUs, AMD is forced to delay the introduction of the part.
This comes as a huge hit to AMD, at the time that evrything was looking somewhat better. On paper and in practice, its Chipsets Series 7 are world's finest at the moment - PCIe Gen2 implementation is near-perfect, old Athlon 64 X2 parts got a new life on them (insane HyperTransport overclocking options), while Radeon HD 3850 and 3870 are once again sparking a huge war in world of 3D graphics.
However, it turns out that the processor division of AMD botched this time around. We asked AMD to provide us with official statement on this huge problem, and we got a reply back from the firm:
"The Translation Lookaside Buffer (TLB) errata is an L3 protocol issue causing a system hang when running certain client workload applications independent of platform. AMD is immediately introducing an updated BIOS which will correct the TLB errata".
This problem was found during speed-binning the B2 revision processors, and this was the cause for the Phenom FX 3.0 GHz delay. It turns out that some CPUs running at 2.4 GHz or above in some benchmarking combinations, while all four cores are running at 100% load, can cause a system freeze.
While benchmark software vendors had some problems detecting how new memory controller work - both SiSoft Sandra XII and Everest 4.20 were returning single-channel results, regardless of memory controller being used in SC/DC, dual-72-bit or 144-bit- we are still shocked to learn of this situation, that will end up with dire consequences for AMD's management.
AMD already issued a fix to all of its motherboard/system partners, so if you already own a 790FX motherboard or plan to buy a Phenom system, make sure to update the BIOS. 9500 (2.2 GHz) and 9600 (2.3 GHz) parts are unaffected by the errata. Some 9500/9600 parts may even be overclocked to 2.6, 2.8, 2.9, 3.0 GHz and they will have no problems whatsoever, while some will have this error. In any case, you should update the BIOS of your shiny new Phenom system is clocked higher than 2.4 GHz.
According to sources close to the company, 2.4, 2.6, 2.8, 3.0 and faster parts will appear on the market when the B3 revision comes to life. B3 revision is key CPU stepping for AMD's future, since it is considered a speed-bin of B1 and B2. With this errata fixed, Phenoms will have no problems competing against Intel in clock-per-clock action, but it will bring serious disappointment to AMD fanboys and market itself. They are probably blubbing already.
Now, we wonder did AMD learn a lesson here and will the company put micro-code update function in its future cores such as Bulldozer, Fusion and so on, or will the Texas part of the company still consist out of 9 to 5vers who will go home at 5PM and not fix problems that are causing this company to bleed
