Ram timing issues (Bandwidth efficiency)

jpeizer · 06-28-2009, 11:36 PM

Problem:
While using heavy graphics programs at a random time my computer will turn off, normally once a day. once I turn the computer back on I will have about 30% performance until the next day. I have figured this issue is a result of an overheating Video card so in order to find out where my problem lies I have installed two programs (SpeedFan and Sandra). speed fan ran my GPU at an avg. of 51C. but I noticed my system (motherboard) was running at 102-108C. This is then considered way to high, so to double check the temp and further investigate the issue ran analyses in Sandra and received the same info. so I started running benchmarks to see what has the worst rating and it turned out to be ram. At least this is what I think...

After running benchmarks on my ram this is the results I received..

SiSoftware Sandra

Benchmark Results
Aggregate Memory Performance : 3.64GB/s
Int Buff'd iSSE2 Memory Bandwidth : 3.78GB/s
Float Buff'd iSSE2 Memory Bandwidth : 3.5GB/s
Results Interpretation : Higher index values are better.

Windows Experience Index
Current Chipset/Memory : 5.0
Results Interpretation : Higher index values are better.

Int Buff'd iSSE2 Memory Bandwidth
Assignment : 4GB/s
Scaling : 3.63GB/s
Addition : 3.72GB/s
Triad : 3.81GB/s
Data Item Size : 16bytes
Buffering Used : Yes
Offset Displacement Used : Yes
Bandwidth Efficiency : 30.23% <================

Float Buff'd iSSE2 Memory Bandwidth
Assignment : 3.62GB/s
Scaling : 3.41GB/s
Addition : 3.51GB/s
Triad : 3.43GB/s
Data Item Size : 16bytes
Buffering Used : Yes
Offset Displacement Used : Yes
Bandwidth Efficiency : 27.95% <================

Performance Test Status
Result ID : nVidia C55 Host Bridge
Platform Compliance : x64
Total Memory : 4GB
Memory Used by Test : 2GB
NUMA Support : No
SMP (Multi-Processor) Benchmark : No
Total Test Threads : 2
Multi-Core Test : Yes
SMT (Multi-Threaded) Benchmark : No
Processor Affinity : P0C0T0 P0C1T0
System Timer : 25MHz
Page Size : 4kB
Use Large Memory Pages : No

Features
SSE Technology : Yes
SSE2 Technology : Yes
SSE3 Technology : Yes
Supplemental SSE3 Technology : Yes

Chipset
Model : nVidia C55 Host Bridge
URL : http://www.nvidia.com
OEM Device Name : nVidia C55 Host Bridge
URL : http://www.nvidia.com
Revision : K3
Front Side Bus Speed : 4x 400MHz (1.6GHz)
Width : 64-bit
Maximum Bus Bandwidth : 12.5GB/s

Performance Tips
Warning 5400 : Low bandwidth efficiency (advanced). Check memory timings and settings. <================

Here is a link to my system settings, I used this link so this post will not be so long.

LINK: http://www.jpeizer.com/systemspecs/

Question:
How can I improve my Bandwidth Efficiency (shown in the red arrows), as stated by Sandra I know how to change the timing of the ram but do not know the timing it should be at. Or if you see another problem please let me know.

P.S. I hope somebody is up to the challenge.

**Tyree** · 06-30-2009, 08:08 AM

Check your CPU & System (Mobo) temps in the Bios for an accurate reading. If the CPU is not running hot, it sounds like poor case ventilation/circulation.

06-28-2009, 11:36 PM	#1 (permalink)
jpeizer Registered User Join Date: Jun 2009 Posts: 1 OS: Tri boot (ubuntu, XP SP3, Vista 64Bit SP2)	Ram timing issues (Bandwidth efficiency) Problem: While using heavy graphics programs at a random time my computer will turn off, normally once a day. once I turn the computer back on I will have about 30% performance until the next day. I have figured this issue is a result of an overheating Video card so in order to find out where my problem lies I have installed two programs (SpeedFan and Sandra). speed fan ran my GPU at an avg. of 51C. but I noticed my system (motherboard) was running at 102-108C. This is then considered way to high, so to double check the temp and further investigate the issue ran analyses in Sandra and received the same info. so I started running benchmarks to see what has the worst rating and it turned out to be ram. At least this is what I think... After running benchmarks on my ram this is the results I received.. SiSoftware Sandra Benchmark Results Aggregate Memory Performance : 3.64GB/s Int Buff'd iSSE2 Memory Bandwidth : 3.78GB/s Float Buff'd iSSE2 Memory Bandwidth : 3.5GB/s Results Interpretation : Higher index values are better. Windows Experience Index Current Chipset/Memory : 5.0 Results Interpretation : Higher index values are better. Int Buff'd iSSE2 Memory Bandwidth Assignment : 4GB/s Scaling : 3.63GB/s Addition : 3.72GB/s Triad : 3.81GB/s Data Item Size : 16bytes Buffering Used : Yes Offset Displacement Used : Yes Bandwidth Efficiency : 30.23% <================ Float Buff'd iSSE2 Memory Bandwidth Assignment : 3.62GB/s Scaling : 3.41GB/s Addition : 3.51GB/s Triad : 3.43GB/s Data Item Size : 16bytes Buffering Used : Yes Offset Displacement Used : Yes Bandwidth Efficiency : 27.95% <================ Performance Test Status Result ID : nVidia C55 Host Bridge Platform Compliance : x64 Total Memory : 4GB Memory Used by Test : 2GB NUMA Support : No SMP (Multi-Processor) Benchmark : No Total Test Threads : 2 Multi-Core Test : Yes SMT (Multi-Threaded) Benchmark : No Processor Affinity : P0C0T0 P0C1T0 System Timer : 25MHz Page Size : 4kB Use Large Memory Pages : No Features SSE Technology : Yes SSE2 Technology : Yes SSE3 Technology : Yes Supplemental SSE3 Technology : Yes Chipset Model : nVidia C55 Host Bridge URL : http://www.nvidia.com OEM Device Name : nVidia C55 Host Bridge URL : http://www.nvidia.com Revision : K3 Front Side Bus Speed : 4x 400MHz (1.6GHz) Width : 64-bit Maximum Bus Bandwidth : 12.5GB/s Performance Tips Warning 5400 : Low bandwidth efficiency (advanced). Check memory timings and settings. <================ Here is a link to my system settings, I used this link so this post will not be so long. LINK: http://www.jpeizer.com/systemspecs/ Question: How can I improve my Bandwidth Efficiency (shown in the red arrows), as stated by Sandra I know how to change the timing of the ram but do not know the timing it should be at. Or if you see another problem please let me know. P.S. I hope somebody is up to the challenge.

06-30-2009, 08:08 AM	#2 (permalink)
Tyree Mentor Hardware Team Join Date: May 2009 Location: Illinois Posts: 8,368 OS: XP Pro-7RC-Mandriva My System	Re: Ram timing issues (Bandwidth efficiency) Check your CPU & System (Mobo) temps in the Bios for an accurate reading. If the CPU is not running hot, it sounds like poor case ventilation/circulation. __________________ Posting your PC specs will help us to help you quicker and more efficiently.