Jump to content
Corsair Community

D975XBX2 and TWIN2X2048C4 memory settings


pisles

Recommended Posts

Hello, I have the TWIN2X2048-6400C4 installed on the Intel BOXD975XBX2KR motherboard.

 

The BIOS reports the memory SPD as: 5.0-4-4-18

 

The memory configuration in the BIOS has the following options and ranges:

 

Memory Performance Profile - automatic/manual/profile 1

Ref Freq. – default/333/266/200/133 MHz

Mem. Freq – 800/667/533/400 MHz

tCL – 3/4/5/6

tRCD – 2/3/4/5

tRP – 2/3/4/5

tRASmin – 4 to 18 (increments of 1)

Mem. Voltage – 1.80 to 2.80 (increments of 0.04)

 

The <AUTOMATIC> setting has the memory setup as:

 

default-800-5-5-5-18-1.84

 

Selecting <PROFILE 1> sets the memory as:

 

default-800-4-4-4-12-2.12

 

This PROFILE 1 setting appears to correspond with the TWIN2X2048-6400C4 specifications.

 

Would the PROFILE 1 setting be the most appropriate or would you suggest other manual settings?

 

Thanks,

Patrick

Link to comment
Share on other sites

Thanks for the reply, I first tried using the Memory Performance Profile 1 - which seemed to have all the proper settings - but that resulted in a blank screen and no computer response. After figuring out how to get into the bios maintenance mode to reset the bios settings to default, I was able to then manually set the 4-4-4-12 at 800Mhz and everthing has been working fine since.

 

I will go find the memtest86+ and make sure all is well.

Link to comment
Share on other sites

I ran the Memtest86+ with the 800-4-4-4-12-2.12V manual memory performance profile settings. Ran one complete pass (all I had time for) without any errors. Using CPU-Z, obtained the configuration information listed below. Noted that the FSB:DRAM ratio is 2:3 (since each DIMM is at 400Mhz while the bus is at 266Mhz). I have seen other threads recommending setting frequencies to get 1:1, which would mean dropping the BIOS memory freq. setting from 800 to 667. I wish to obtain the maximum memory performance while maintaining the maximum system stability. I will be using my new system for extensive HDV editing.

 

What I have set now seems to work, but any additional advice to improve performance and/or stability would be appreciated.

 

CPU-Z results:

 

Number of cores 4

Number of threads 4 (max 4)

Name Intel Core 2 Extreme QX6700

Codename Kentsfield

Specification Intel® Core2 Quad CPU @ 2.66GHz

Core Speed 2666.7 MHz (10.0 x 266.7 MHz)

Rated Bus speed 1066.7 MHz

Stock frequency 2666 MHz

 

Chipset

------------------------------------------------------------------------------

Northbridge Intel i975X rev. 00

Southbridge Intel 82801GB (ICH7) rev. 01

Memory Type DDR2

Memory Size 2048 MBytes

Memory Frequency 400.0 MHz (2:3)

CAS# 4.0

RAS# to CAS# 4

RAS# Precharge 4

Cycle Time (tRAS) 12

Bank Cycle Time (tRC) 20

 

Memory SPD (same values reported for both DIMMS

------------------------------------------------------------------------------

Size 1024 MBytes

Max bandwidth PC2-6400 (400 MHz)

Part number CM2X1024-6400C4

Manufacturing date Week 29/Year 06

 

Attributes

Number of banks 2

Data width 64 bits

Correction None

EPP yes (1 profiles)

 

Timings table

Frequency (MHz) 270 400

CAS# 4.0 5.0

RAS# to CAS# delay 4 5

RAS# Precharge 4 5

TRAS 13 18

TRC 15 22

 

EPP profile 1 (full)

Voltage level 2.100 V

Address Command Rate 2T

Cycle time 2.500 ns (400.0 MHz)

tCL 4.0 clocks

tRCD 4 clocks (10.00 ns)

tRP 4 clocks (10.00 ns)

tRAS 12 clocks (30.00 ns)

tRC 22 clocks (55.00 ns)

tWR 6 clocks (15.00 ns)

Link to comment
Share on other sites

Do you plan to OC this machine? The 1:1 at stock settings will actually slow your memory performance from DDR800 to DDR533 speeds. This may or may not be noticeable in real world apps. My suggestion, if you want to experiment would be to set up a test case, such as a video compression. Run it with your stock settings and then run it again after making any changes. This way, you can see if these changes will benefit you in your work as opposed to simply improving a benchmark score.
Link to comment
Share on other sites

I am a newbie to OC'ing - would like to look into it, but will proceed cautiously as I find more info on how to go about it safely.

 

I do have a good Adobe Premier Pro Benchmark tool to help me see if I am making progress.

 

I would still like to understand why setting my BIOS's Memory Performance Profile to <Profile 1>, which appears to be the EPP settings, doesn't work - causes the system to freeze and fail to POST - while manually setting the memory values to 4-4-4-12 and 2.1v and 800MHz works fine. The EPP seems to be these same values except for maybe the Command Rate, tRC and tWR - which I don't have access to manually set.

 

I assume the memory setting for <Automatic> mode is the JEDEC standars for PC6400 (5-5-5-18).

 

Thanks for the help and information - this forum is superb. Any suggestions on formus for Intel motherboards - would be great to have a similar forum for the D975XBX2 board.

Link to comment
Share on other sites

Great thread - thanks!

 

How about this then:

 

My Intel XBX2 MB has 2 frequency references in the performance/memory config section of the bios.

 

Reference Frequency (Default/333/266/200/133) currently at 266

 

Memory Frequency (800/667/533/400) currently at 533

 

My memory is Corsair DDR2-6400C4 and my FSB is at 334, running at 3:00 GHz.

 

CPU-Z currently reports the FSB:RAM as 1:1, which I thought was the ideal.

 

What is the difference between Reference freq and Memory freq?

 

And what should they be for best performance at this FSB?

 

Thanks!

 

The Gunny

Link to comment
Share on other sites

  • Corsair Employees

DDR2 Memory runs at:

DDR2-533 = 266 Clock Frequency 2 X 266 = DDR2 533

DDR2-667 = 333 Clock Frequency 2 X 333 = DDR2 667

DDR2-800 = 400 Clock Frequency 2 X 400 = DDR2 800

DDR2-1066 = 533Clock Frequency 2 X 533 = DDR2 1066

 

Intel CPU:

533 MHz = 133 MHz Clock Freq. 133 X 4

800 MHz = 200 MHz Clock Freq. 200 X 4

1066 MHz = 266 MHz Clock Freq. 266 x 4

 

So you are under clocking the memory but over clocking your CPU and should be getting better over all performance.

Link to comment
Share on other sites

I am still trying to understand (as stated previously) the EPP setting and why it doesn't seem to work on my MB even though it appears to be an option provided in the the BIOS:

 

I would still like to understand why setting my BIOS's Memory Performance Profile to <Profile 1>, which appears to be the EPP settings, doesn't work - causes the system to freeze and fail to POST - while manually setting the memory values to 4-4-4-12 and 2.1v and 800MHz works fine. The EPP seems to be these same values except for maybe the Command Rate, tRC and tWR - which I don't have access to manually set.

 

I assume the memory setting for <Automatic> mode is the JEDEC standars for PC6400 (5-5-5-18).

 

Thanks for the help and information - this forum is superb.

 

Any suggestions on formus for Intel motherboards - would be great to have a similar forum for the D975XBX2 board - for Q&A/OC info.

Link to comment
Share on other sites

  • Corsair Employees

The EPP setting will not work in Intel platform MB's from what we have seen only with AM2!

 

OK, so if I am over clocking my CPU to 334, and setting memory to 667 (333 X 2), why does CPU-Z show a ratio of 4:5 instead of 1:1?

Because you are setting the memory frequency ratio to 5:4 when you set the memory Freq at 667 MHz. Default CPU speed was posted previously in order for it to be 1-1 you would set the memory Freq at 533 MHz.

Link to comment
Share on other sites

Nice of Intel to provide us that option in BIOS - when it doesn't work!

 

Thanks for all the info RAM GUY, it has really helped me understand and setup my new system.

 

----- added:

 

As stated before, I am an overclocking newbie - only looking to get a reasonable performance gain without sacrificing too much system stability or life. Doing a little research, I have found reviews of the QX6700 that suggest it can be easily overclocked by simply adjusting the Core:FSB ratio (which is unlocked in this CPU). Reviewers have successfully clocked to 3.2 GHz (12x multiplier) at the stock voltage setting of 1.35v. They claim this method (just adjusting the multiplier and possibly tweaking the voltage a little) would maintian compatibily with all other system components, including memory settings. Of course one would have to watch CPU temperatures closely as this processor already runs fairly hot (I believe I have been typically seeing 38-46 C with stock settings and heatsink/fan) - haven't run any full load tests to see what it will get up to yet. Board temps run around 38 C.

 

I was thinking of trying a core speed of 2.93Ghz (11 x 266.7MHz) - bus speed would remain the same (1066.7MHz). I haven't found any other info yet on overclocking this system, but still looking.

 

Does this approach seem appropriate?

Should the memory work in the this configuration with the exiting settings (800MHz-4-4-4-12-2.1v)?

 

Thanks,

Pat

Link to comment
Share on other sites

I am still trying to understand (as stated previously) the EPP setting and why it doesn't seem to work on my MB even though it appears to be an option provided in the the BIOS:

 

 

 

Thanks for the help and information - this forum is superb.

 

Any suggestions on formus for Intel motherboards - would be great to have a similar forum for the D975XBX2 board - for Q&A/OC info.

 

http://www.abxzone.com/forums/intel-chipsets/98282-intel-d975xbx-bad-axe-162.html

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...