820 the 2.8D
.09nm die process
Clock speed- 2.8GHz
EMT64 support
2MB of L2 cache split 2x1MB for each core
2 physical cores
HyperThreading- No
Projected Pricing in 10K lots- $241
230 Million Transistors
Execute Disable Bit Yes
Package Size 206mm2
  
  
670 3.8
0.09nm die process
Clock Speed 3.8GHz
EMT64 support
2MB of L2 cache
1 core
HyperThreading-Yes
Projected Pricing in 10K lots: 641
Execute Disable Bit: Yes
169 Million Transistors
Package Size: 206mm2
  
  
Intel has rethought its naming strategy on CPUs recently. Prior to last year
Intel named it’s CPUs by the clock speed, e.g. Intel 3.4 GHz Pentium 4.
With the release of the LGA-775 platform, Intel has started naming its CPUs
by a totally different scheme. Prescott CPUs were named 5xx with the Extreme
Edition still going by the clock speed for the name followed by Extreme Edition.
When Intel announced support for 64-bit extensions in their lineup earlier this
year, Intel changed their nomenclanture to the 6xx series. With the introduction
of dual core CPUs, Intel changed the naming system again to the 8xx series.
There are currently four dual core CPUs on the Intel lineup for consumer CPUs.
They are the 820, the 830 840 and 840 Extreme Edition CPUs. The 840 Extreme
Edition is noted for the inclusion of HyperThreading and a clock speed of 3.2GHz,
the fastest available dual-core CPU. HyperThreading shows the presence of four
logical processing units (2 cores+HyperThreading). The 820, 830 and 840 CPUs
don’t include the features of HyperThreading and thus have two logical
processing units; the same as today’s single core CPUs.
The 670 runs at 3.8GHz, the fastest currently available Intel CPU along with
the non-64-bit supporting 570. This processor does not feature dual cores on
the same die, but is clocked higher than even Intel’s 3.73GHz Extreme
Edition. The 820 CPU runs at a conservative 2.8GHz. One thing is this CPU is
targeted at the $240-250 price range. The CPU has all of the features of the
faster dual-core CPUs except Hyperthreading.
The cache sizes on the 820 CPU consist of 16KB of L1 data, 12KB of L1 entry
cache and 2MB of L2 cache. As there are two CPU cores on the same die, Intel
split the L2 cache into two banks, one for each CPU core. The 670 has 16KB of
L1 cache, 12KB of L1 entry cache and 2MB of L2 cache. More L2 cache can improve
performance as the cache is used to store data that a thread is currently working
on. Intel has implemented their own version of 64-bit instructions for their
64-bit capable CPUs. They call their 64-bit instruction set EMT64 basically
mirroring AMD’s 64-bit instruction set. Microsoft recently shipped the
full version of Windows XP 64-bit to manufacturers and Intel needed to support
the new operating system. Both the 670 and 820D support the instructions.
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