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Inexpensive AMD Processor Roundup

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Although we've tested most processors from Intel, no due attention has been paid to a lot of CPUs from AMD. Today we shall make amends and examine as many as five affordable processors from this company.


CPU Athlon II X2 265 Athlon II X3 455 Phenom II X2 565 Phenom II X4 840 Phenom II X4 925
Core Regor Rana Callisto Propus Deneb
Process technology, nm 45 45 45 45 45
Core clock rate, GHz 3.3 3.3 3.4 3.2 2.8
Multiplier 16.5 16.5 17 16 14
Uncore clock, GHz - - 2 - 2
Cores/threads 2/2 3/3 2/2 4/4 4/4
L1 cache, I/D, KB 64/64   64/64 64/64 64/64
L2 cache, KB 2x1024 3x512 2x512 4x512 4x512
L3 cache, MB - - 6 - 6
RAM 2xDDR3-1066 2xDDR3-1333 2xDDR3-1333 2xDDR3-1333 2xDDR3-1333
Socket AM3 AM3 AM3 AM3 AM3
TDP, W 65 95 80 95 95

Today's lineup to test will include Athlon II X2 265 and X3 455, Phenom II X2 565, X4 840 and X4 925. All except the last two represent evolutionary changes of respective lineups — they just have higher clock rate than previous models. Just the opposite, Phenom II X4 925 is one of the oldest in its series. As you may remember, AMD Phenom II X4 920 was one of the first in the lineup, and X4 925 announced a few months later only differs by having DDR3 support (and support for AMD's updated platform as well). These processors are still available in stores — for a rather attractive price for a quad-core processor.

It will also be interesting to compare Phenom II X4 925 with Phenom II X4 840. The latter doesn't belong to the old 800 series (that only offered smaller L3 cache compared to the 900 series), but is based on the same die as Athlon II X4. In fact, it should've been named "Athlon II X4 650," because its only difference from Athlon II X4 645 is the clock rate which is 100 MHz higher. But AMD decided otherwise, so let's see if that was justified.

CPU Athlon II X4 645 Phenom II X3 740
Core Propus Heka
Process technology, nm 45 45
Core clock rate, GHz 3.1 3.0
Multiplier 15.5 15
Uncore clock, GHz - 2
Cores/threads 4/4 3/3
L1 cache, I/D, KB 64/64 64/64
L2 cache, KB 4x512 3x512
L3 cache, MB - 6
RAM 2 x DDR3-1333 2 x DDR3-1333
Socket AM3 AM3
TDP, W 95 95

For comparison we chose Athlon II X4 645 (for reasons mentioned above) and Phenom II X3 740. The latter is leaving the market, but it was rather popular in its days, so comparing it to Phenom II X4 840 and Phenom II X4 925 will be interesting.

CPU Core i3-2100 Pentium E6800
Core Sandy Bridge DC Wolfdale-2M
Process technology, nm 32 45
Core clock rate, GHz 3.1 3.33
Multiplier 31 14.5
Turbo Boost - -
Cores/threads 2/4 2/2
L1 cache, I/D, KB 32/32 32/32
L2 cache, KB 2x256 2048
L3 cache, MB 3 -
Uncore clock, GHz 3.1 -
RAM 2 x DDR3-1333 -
FSB clock rate, MHz - 1066
Socket LGA1155 LGA775
TDP, W 65 65

And we also selected two Intel processors. Firstly, Core i3-2100, an obvious competitor. It's a bit more expensive, but also fast and promising in terms of platform. Secondly, Pentium E6800, an old, affordable model that still sells and competes directly with Athlon II X2, Athlon II X3 and even Phenom II X4 920.

  Motherboard RAM
AM3 Gigabyte 890FXA-UD7 (AMD 890FX) Corsair CM3X2G1600C9DHX (2x1333; 7-7-7-20-1T, Unganged Mode)
LGA1155 Gigabyte P67A-UD5 (P67) Kingston KVR1333D3N9K3/6G (2x1333; 9-9-9-24)
LGA775 ASUS P5Q Deluxe (P45) Crucial Ballistix BL2KIT25664AA80A (2x1066, 5-5-5-15-2T)

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Page 1: Introduction, testbeds

Page 2: Tests

Page 3: Tests cont'd, final thoughts

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