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Builder’s Guide for AMD Athlon™ 64 Processor-Based
Desktops and Workstations
31684 Rev.
3.00 September
2004
Table 3. AMD Athlon™ 64 Processor Series (Continued)
Series
AMD Athlon™ 64 FX
(939-Pin or 940-Pin)
Processor
AMD Athlon™ 64
(939-Pin) Processor
AMD Athlon™ 64
(754-Pin) Processor
Memory Type
Registered (940-pin) /
Unbuffered (939-pin)
Unbuffered Registered
or
unbuffered (not
interchangeable, board
designed for one or the
other)
Memory Width
128-bit + ECC or
64-bit + ECC
128-bit + ECC or
64-bit + ECC
64-bit + ECC
DIMM Sizes
32 Mbytes – 4 Gbytes
(940-pin) /
32 Mbytes – 1 Gbyte
(939-pin)
32 Mbytes – 1 Gbyte
32 Mbytes – 1 Gbyte
(unbuffered)
32 Mbytes – 4 Gbytes
(registered)
DRAM Devices
4, 8, and 16 bits wide
(940-pin) /
8 and 16 bits wide
(939-pin)
8 and 16 bits wide
4, 8, and 16 bits wide
ECC DRAM protection
Yes Yes Yes
HyperTransport™
technology
Yes Yes Yes
HyperTransport™ link
width
16 bits
x
16 bits
16 bits
x
16 bits
16 bits
x
16 bits
HyperTransport™ bus
frequency
800 MHz (940-pin) /
1.0 GHz (939-pin)
1.0 GHz
800 MHz
AMD64
Yes Yes Yes
HyperTransport™
bandwidth
6.4 Gbytes/s (940-pin) /
8 Gbytes/s (939-pin)
8 Gbytes/s
6.4 Gbytes/s
Simultaneous 32- and
64-bit computing
Yes Yes Yes
L1 Cache size
(data/instruction)
64 Kbytes/64 Kbytes
64 Kbytes/64 Kbytes
64 Kbytes/64 Kbytes
L2 Cache size
1 Mbyte
512-Kbyte and
1-Mbyte options
256-Kbyte, 512-Kbyte,
and 1-Mbyte options
Pipeline stages
(integer/floating point)
12/17 12/17 12/17
30 Hardware
Considerations
Chapter 4