The 45nm C2D and C2Q have been around for
a while now and they really made a huge difference to the Core 2 line of
CPUs. The smaller process brought with it lower voltages and lower
temperatures and gave us higher overclocks. Just about everyone
could take their new C2D CPUs and run them at 4Ghz and beyond.
Intel has just recently released a new top dog to their 45nm C2D line,
the E8600. The E8600 brings with it more stock MHz and the magical
10 multiplier. It also brought with it a new stepping. When
people started looking at the CPU-z screen, they noticed an E0 where the
C0 used to be. The new stepping also made its way down to the
E8400 and E8500. Today we are going to look at identifying the new
cores and some overclocking.
- CPUID will change from 0x10676 to
- Power Status Indicator (PSI) is supported
- PECI implementation change
- New instructions added - XSAVE/XRSTOR
- New ISA extension for save/restoring context of x87, SSE, and
future processor state
- New feature added - ACNT2
- Improved mechanism for determining processor utilization. To be
used for more efficient P-state determination.
- Package change to Halide free package
For the new stepping you should not need a BIOS
update, but you know how that goes. Check to see if your
motherboard has a new BIOS and if it does, flash it.
If you are fortunate enough to have a local store
that stocks CPU's, the quickest way to identify the new CPU is by
the packaging. Intel's new environmentally friendly packaging
is visibly smaller. However, you should not use this as your
sole means of identification. Some older steppings might have
found their way into the new packaging, so you're going to have to
look at the label.
Looking at the label is the only way you can be
100% positive that you have a new E0 stepping. Hopefully, you
will have a store with friendly staff that will be patient with you
as you ask to look at all of the CPUs they have in stock. I
was fortunate and the guys at
really hooked me up. They only briefly looked at me like I was
crazy. Anyway, you want to look at the S-spec #. The new
E0 steppings are as follows:
If you're out and about and don't have these
memorized, just remember the "9". The older steppings do not
have a "9" in them anywhere.