Hardware & Technology Comparisons

Processor Models

	Intel Xeon DP	Intel Xeon EM64T (Nocona)	AMD Opteron
Modular, glueless scalability	Requires Northbridge	Requires Northbridge	Yes
SMP Capabilities	Up to 2-way	Up to 2-way	Up to 8-way
Direct Connect Architecture	No	No	Yes

Intel Xeon DP

Xeon DP Highlights

Features	Benefits
Intel NetBurst Microarchitecture with 400 MHz system bus	High bandwidth between the processor and the rest of the system bus system improves throughput and performance.
On-die multi-threading support increases the number of transactions and users a server system can support.
Streaming SIMD Extensions 2	144 new instructions improve response times for media servers and secure transactions.

Intel Xeon EM64T (Nocona)

Intel Xeon EM64T (Nocona) Highlights

Architecture	90 nm
Level 1 Cache	Execution Trace Cache
Available Clock Speeds	2.8 GHz +
Front Side Bus	800 MHz
I/O Bandwidth	Up to 6.4 GB / sec.; PCI Express I/O, PCI Express x16 Graphics
RAM	Dual Channel DDR and DDR2

Features	Benefits
Intel NetBurst Microarchitecture with 800 MHz system bus	Higher throughput within the processor and out to memory and I/O for improved headroom.
Improved performance on threaded server applications provides support for more users or faster response times.
Streaming SIMD Extensions 2	144 new instructions improve response times for media servers and secure transactions.

AMD Opteron

Opteron Highlights

Modular, glueless scalability	1.4 - 2.4 GHz FSB
Up to 8-way SMP Capability	DDR 266 / 333 / 400 memory support
Direct Connect Architecture	128 KB L1 cache size (max) 1 MB L2 cache
High Performance 32-bit and 64-bit computing	Maximum I/O bandwidth 2P system 12.8 GB/s
Hyper-Transport technology	Maximum I/O bandwidth 4P system 25.6 GB/s
Integrated DDR memory controller	SIMD instruction set support SSE, SSE2

Features	Benefits
Simultaneous 32- and 64- bit computing capabilities	Allows users to run 32-bit and/or 64-bit applications and operating systems as they desire -- without sacrificing performance.
Direct Connect Architecture addresses and helps reduce the real challenges and bottlenecks of system architectures	Provides optimized memory performance, balanced through put, expandable I/O, and more linear symmetrical multiprocessing.
Support of up to three (3) coherent HyperTransport links, providing up to 19.2 GB/s peak bandwidth per processor	Provides substantial I/O bandwidth for your current and future application needs

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