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AMD Athlon64 - 64-bit vs. 32-bit Head On Comparison

AMD Athlon64 - 64-bit vs. 32-bit Head On Comparison - PCSTATS
Abstract: What does 64-bit, specifically the 64-bit support built into AMD's Athlon 64 and AthlonFX processors, have to offer the gamer and enthusiast markets?
Filed under: CPU / Processors Published:  Author: 
External Mfg. Website: AMD Oct 18 2004   Mike Dowler  
Home > Reviews > CPU / Processors > AMD Athlon64

64-bit Benchmarks: RSA Cyrptography

RSA Cryptography Source: PCStats

The RSA benchmarks consist of a set of 32-bit and 64-bit executables that measure the performance of key RSA cryptography routines. The 64-bit executables use RSA code that has been optimized for AMD64. There are a set of 32-bit executables that have also been optimized for AMD64 as well.

RSA
AES-128 Encrypt Seconds Ranking
WindowsXP Pro w/SP1 (32 bit Mode) 3.17

WindowsXP 64 (32 bit Mode)

3.187

WindowsXP 64 (64 bit Mode)

1.78

AES-128 Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 3.24

WindowsXP 64 (32 bit Mode)

3.188

WindowsXP 64 (64 bit Mode)

2.36

Triple-DES Encrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 6.36

WindowsXP 64 (32 bit Mode)

6.36

WindowsXP 64 (64 bit Mode)

6.22

Triple-DES Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 6.25

WindowsXP 64 (32 bit Mode)

6.38

WindowsXP 64 (64 bit Mode)

6.25

RC4 Encrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 2.05

WindowsXP 64 (32 bit Mode)

2.05

WindowsXP 64 (64 bit Mode)

1.81

RC4 Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 2.05

WindowsXP 64 (32 bit Mode)

2.05

WindowsXP 64 (64 bit Mode)

1.81

RSA Key 256 Optimized 2 Primes Encrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 3.81

WindowsXP 64 (32 bit Mode)

4.13

WindowsXP 64 (64 bit Mode)

3.31

RSA Key 256 Optimized 2 Primes Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 4.03

WindowsXP 64 (32 bit Mode)

4.11

WindowsXP 64 (64 bit Mode)

4.7

RSA Key 512 Optimized 2 Primes Encrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 3.34

WindowsXP 64 (32 bit Mode)

3.33

WindowsXP 64 (64 bit Mode)

2.44

RSA Key 512 Optimized 2 Primes Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 2.72

WindowsXP 64 (32 bit Mode)

2.73

WindowsXP 64 (64 bit Mode)

1.56

RSA Key 1024 Optimized 3 Primes Encrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 2.83

WindowsXP 64 (32 bit Mode)

2.86

WindowsXP 64 (64 bit Mode)

1.52

RSA Key 1024 Optimized 3 Primes Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 2.42

WindowsXP 64 (32 bit Mode)

2.44

WindowsXP 64 (64 bit Mode)

1.19

RSA Key 1024 Optimized 2 Primes Encrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 3.02

WindowsXP 64 (32 bit Mode)

3.05

WindowsXP 64 (64 bit Mode)

1.47

RSA Key 1024 Optimized 2 Primes Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 2.47

WindowsXP 64 (32 bit Mode)

2.44

WindowsXP 64 (64 bit Mode)

0.92

RSA Key 2048 Optimized 2 Primes Encrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 3.99

WindowsXP 64 (32 bit Mode)

4

WindowsXP 64 (64 bit Mode)

1.48

RSA Key 2048 Optimized 2 Primes Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 2.64

WindowsXP 64 (32 bit Mode)

2.72

WindowsXP 64 (64 bit Mode)

0.64

RSA Key 4096 Optimized 2 Primes Encrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 4.94

WindowsXP 64 (32 bit Mode)

4.11

WindowsXP 64 (64 bit Mode)

1.27

RSA Key 4096 Optimized 2 Primes Decrypt

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 12.75

WindowsXP 64 (32 bit Mode)

12.73

WindowsXP 64 (64 bit Mode)

2.97

SHA-1 Digest

Seconds

Ranking

WindowsXP Pro w/SP1 (32 bit Mode) 3.41

WindowsXP 64 (32 bit Mode)

3.41

WindowsXP 64 (64 bit Mode)

3.17

This benchmark provides the best straight illustration of the mathematical and data handling capabilities of the AMD Athlon 64 platform running in 64-bit mode. The more complicated the encryption gets, the better 64-bit does in comparison with the same operations in 32-bit mode.

The most obvious example here is the 'RSA Key 4096 Optimized 2 Primes Decrypt' test (second up from the bottom), which the Athlon 64 in full 64-bit mode completed four times faster than in either 32-bit mode. This particular test involves decrypting RSA encrypted files with huge 4096 bit numerical keys. In a case like this, the more register space your processor has to store values, the better.

The boost in 64-bit mode certainly proves this to be true. When dealing with numbers too large to store in its registers, the processor must split them up and store them in individual cache or system memory locations. This takes precious time. Obviously, doubling the space available in the registers and increasing the number of registers available will result in less data needing to be shuffled off to the cache or system memory for storage, increasing performance.

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Contents of Article: AMD Athlon64
 Pg 1.  AMD Athlon64 - 64-bit vs. 32-bit Head On Comparison
 Pg 2.  AMD64 and 64-bit Operations
 Pg 3.  No Mess Solution for 64-bit
 Pg 4.  AMD's Second Major Innovation
 Pg 5.  64-bit Extra Registers
 Pg 6.  64-bit Benchmarks: nvidia, mini-gzip, DivX
 Pg 7.  64-bit Benchmarks: Streams
 Pg 8.  — 64-bit Benchmarks: RSA Cyrptography
 Pg 9.  From 32-to-64-bit Conclusions

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