Eng. samples AMD Athlon 64 FX-64 and AMD Athlon 64 FX-24

[max1024]

Now I'm interesting in AMD Athlon 64 FX history and find very interesting engineering samples. I never heared about it before and they are not in the cpu-world cpu catalog list. May be somebody knows something more about them?

AMD Athlon 64 FX-64



AMD Athlon 64 FX-24



all fx list

[max1024]

So nobody has not such ES FX cpus in collection?

[CPUShack]

Xsecret may, I sent him a message

[xsecret]

They are not ES. Athlon 64 FX-64 has been released in very small batch, targetted as LN2 OC. Similar to the later TWKR CPU.

The FX-24 is probably just a BIOS Bug. On AMD CPUs, the PSN (Processor String name) is writable and set by BIOS at boot time. If the BIOS is old and does not recognize the CPU, it will write a wrong PSN.

PSN is hardcoded and read only on Intel CPUs.

[max1024]

[xsecret]

Athlon 64 FX-64 is just a rebranded Opteron 1222. It's a rare production part (but not ES).

[frag_]

But Opteron 1222 miltiplier has 15 as maximum value, isn't it?
If this cpu-s submission isn't bugged then it can't be Opteron 1222.
At least they should unlock it.

[max1024]

frag_
rebranded xsecret think mean, that they both have identical core but differents in cpu id and free multiple from FX-64.

[frag_]

Rebranded means the same silicon with different name, which is not the case here.

[max1024]

frag_
the silicon is the same, but must be one difference, for ex. FX51 the same as AMD Opteron 248 he also had ceramic packing but bios recognised them differ. I do not know mechanism but they are very common in silicon to.