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– Eight memory channels are available in eX4, compared to four memory
channels in X3.
– Memory bandwidth improved 1.6x is eX4. The eX4 has 34.1 GBps read
and 17.1 GBps write aggregate peak memory bandwidth versus
21.33 GBps aggregate peak memory bandwidth in X3.
– Lower memory latency in the eX4 because the eX4 uses DDR2 533 MHz
memory compared to DDR2 333 MHz memory in X3.
Direct connect I/O
– Earlier X3 models used a PCI-X chipset instead of the PCI Express
chipset in eX4.
– The ServeRAID MR10K SAS/SATA RAID controller in the x3950 M2 no
longer shares bandwidth on a shared bus such as the ServeRAID 8i SAS
RAID controller in the x3950 did with devices like the Gigabit Ethernet
controllers in X3. With its own dedicated PCIe slot, the ServeRAID MR10k
has improved throughput and ability to support external SAS devices
through the integrated external SAS port.
– Dedicated Southbridge ESI port to support Southbridge devices such as
RSA II, dual Gigabit Ethernet controllers, IDE DVD-ROM, USB port, Serial
port and Video interface.
Scalability
– Almost twice the increase in scalability port bandwidth for improved
scaling. The eX4 has three scalability ports with increased bandwidth of
30.72 GBps compared to 19.2 GBps in X3.
1.7 Processors
As mentioned previously, the x3850 M2 and x3950 M2 models use one of the
following Intel Xeon Processor models:
Tigerton (code name) processors:
Xeon 7200 series dual-core processors
Xeon 7300 series quad-core processors
Dunnington (code name) processors:
Xeon 7400 series quad-core processors
Xeon 7400 series 6-core processors
Refer to 1.2, "Model numbers and scalable upgrade options" on page 9 for details
about the current models.
Chapter 1. Technical overview
33
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