Originally posted by: Shaga
SiSoftware Sandra
Benchmark Results
RAM Bandwidth Int Buff'd iSSE2 : 6407 MB/s
RAM Bandwidth Float Buff'd iSSE2 : 6337 MB/s
Int Buff'd iSSE2 (Integer STREAM) Results Breakdown
Assignment : 6529MB/s
Scaling : 6509MB/s
Addition : 6296MB/s
Triad : 6294MB/s
Data Item Size : 16 byte(s)
Buffering Used : Yes
Offset Displacement Used : Yes
Bandwidth Efficiency : 92% (estimated)
Float Buff'd iSSE2 (Float STREAM) Results Breakdown
Assignment : 6519MB/s
Scaling : 6518MB/s
Addition : 6180MB/s
Triad : 6133MB/s
Data Item Size : 16 byte(s)
Buffering Used : Yes
Offset Displacement Used : Yes
Bandwidth Efficiency : 91% (estimated)
Performance Test Status
Run ID : SANTA on 25. tammikuuta 2005 at 7:40:05
Memory Used by Test : 512MB
NUMA Support : No
SMP Test : No
Total Test Threads : 1
SMT Test : No
Dynamic MP/MT Load Balance : No
Processor Affinity : P0
Page Size : 4kB
Use Large Memory Pages : No
Chipset 1
Model : Advanced Micro Devices (AMD) Athlon 64 / Opteron HyperTransport Technology Configuration
Front Side Bus Speed : 2x 436MHz (872MHz data rate)
In/Out Width : 16-bit / 16-bit
Maximum Bus Bandwidth : 3488MB/s (estimated)
Logical/Chipset 1 Memory Banks
Bank 0 : 512MB DDR-SDRAM 2.5-3-3-3CL 2CMD
Bank 1 : 512MB DDR-SDRAM 2.5-3-3-3CL 2CMD
Channels : 1
Bank Interleave : 2-way
Speed : 2x 218MHz (436MHz data rate)
Width : 128-bit
Maximum Memory Bus Bandwidth : 6976MB/s (estimated)
Okay, I'm a newbie, I know but... could somebody explain why I'm getting this lousy bandwidth?
SiSoftware Sandra
Benchmark Results
RAM Bandwidth Int Buff'd iSSE2 : 4843 MB/s
RAM Bandwidth Float Buff'd iSSE2 : 4807 MB/s
Int Buff'd iSSE2 (Integer STREAM) Results Breakdown
Assignment : 4690MB/s
Scaling : 4677MB/s
Addition : 4993MB/s
Triad : 5015MB/s
Data Item Size : 16 byte(s)
Buffering Used : Yes
Offset Displacement Used : Yes
Bandwidth Efficiency : 166% (estimated)
Float Buff'd iSSE2 (Float STREAM) Results Breakdown
Assignment : 4670MB/s
Scaling : 4638MB/s
Addition : 4970MB/s
Triad : 4950MB/s
Data Item Size : 16 byte(s)
Buffering Used : Yes
Offset Displacement Used : Yes
Bandwidth Efficiency : 165% (estimated)
Performance Test Status
Run ID : LASHER on martedì 25 gennaio 2005 at 9.23.54
Memory Used by Test : 512MB
NUMA Support : No
SMP Test : No
Total Test Threads : 1
SMT Test : No
Dynamic MP/MT Load Balance : No
Processor Affinity : P0
Page Size : 4kB
Use Large Memory Pages : No
Chipset 1
Model : Advanced Micro Devices (AMD) Athlon 64 / Opteron HyperTransport Technology Configuration
Front Side Bus Speed : 2x 455MHz (910MHz data rate)
In/Out Width : 16-bit / 16-bit
Maximum Bus Bandwidth : 3640MB/s (estimated)
Logical/Chipset 1 Memory Banks
Bank 0 : 512MB DDR-SDRAM 2.0-2-2-2CL 2CMD
Bank 1 : 512MB DDR-SDRAM 2.0-2-2-2CL 2CMD
Bank 2 : 512MB DDR-SDRAM 2.0-2-2-2CL 2CMD
Bank 3 : 512MB DDR-SDRAM 2.0-2-2-2CL 2CMD
Channels : 1
Bank Interleave : 4-way
Speed : 2x 91MHz (182MHz data rate)
Width : 128-bit
Maximum Memory Bus Bandwidth : 2912MB/s (estimated)
If I compare these results with the ones above, I can't understand. I'm running my memory with faster timings. We both are running with 2T and still... what do you suggest?