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Why do timings differ for XMS3200 on Corsair's website?


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On Corsair's website it shows different timings for the TWINX2048-3200 XMS3200 2048MB:

 

TWINX2048-3200 XMS3200 2048MB 3-3-3-8

http://www.corsairmemory.com/corsair/xms.html

 

And when you click on the product number it shows:

 

TwinX2048-3200 consists of a matched pair of CMX1024-3200 memory modules. This memory kit was

developed specifically for graphics applications that require large memory arrays. It offers an unprecedented

combination of high speed and high density. TWINX memory kits are designed to provide the ultimate in

performance and stability in dual channel boards. These parts have been verified to operate at DDR400 (200 MHz at

3-4-4-8) in a dual-channel motherboard.

 

So is it supposed to be 3-3-3-8 or 3-4-4-8? And why is it shown differently?

 

I am inquiring for the ASUS A8N-SLI Premium MB.

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Testing parameters for XMS3200:

 

 

Motherboard make and model: Asus P4C800/-E and/or DFI INFINITY I865/I875 and/or Asus A7N8X and/or ABIT IC7 Max3.

DRAM Clock: 200 MHz

DRAM Timing (overrides SPD values): Manual

System Performance: Normal

SDRAM Bank cycle time (or tRAS): 8

SDRAM Bank Interleave: 4

SDRAM Row Precharge (tRP): 3

SDRAM RAS-to-CAS Delay (tRCD): 3

SDRAM CAS Latency: 3

All other settings are motherboard defaults.

 

I would suggest 2.75 Volts and a max of 2.9 Volts on all of our XMS DDR1 modules.

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Testing parameters for XMS3200:

 

 

Motherboard make and model: Asus P4C800/-E and/or DFI INFINITY I865/I875 and/or Asus A7N8X and/or ABIT IC7 Max3.

DRAM Clock: 200 MHz

DRAM Timing (overrides SPD values): Manual

System Performance: Normal

SDRAM Bank cycle time (or tRAS): 8

SDRAM Bank Interleave: 4

SDRAM Row Precharge (tRP): 3

SDRAM RAS-to-CAS Delay (tRCD): 3

SDRAM CAS Latency: 3

All other settings are motherboard defaults.

 

I would suggest 2.75 Volts and a max of 2.9 Volts on all of our XMS DDR1 modules.

 

I have the ASUS A8N-SLI Premium and does that make a difference?

 

One other thing, why do you suggest 2.75 rather than 2.6? I mean, what was the problem with 2.6?

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You are welcome to try anything you like, but as I said from experience I would suggest 2.75 Volts with all of our XMS modules. The JEDEC spec is 2.6 Volts +- 1.0 Volts and we will warranty them up to 2.9 Volts so 2.75 Is in the middle.
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You are welcome to try anything you like, but as I said from experience I would suggest 2.75 Volts with all of our XMS modules. The JEDEC spec is 2.6 Volts +- 1.0 Volts and we will warranty them up to 2.9 Volts so 2.75 Is in the middle.

 

OK, but 2.6 + - 1.0 volts is 2.5 to 2.7 and 2.6 is in the middle, or is that 2.6 + - 1.0 volts meaning 1.6 to 3.6?

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For the 3200C2:

 

From the link above it shows CAS at 2.5 below for AMD and CAS 2 in the data sheet for AMD. Why is there such a discrepancy?

 

Testing parameters for TWINX3200C2:

TWINX2048-3200C2 Data Sheet

TWINX1024-3200C2 Data Sheet

TWINX512-3200C2 Data Sheet

Motherboard make and model: Asus P4C800/-E and/or DFI INFINITY I865/I875 and/or Asus A7N8X and/or ABIT IC7 Max3.

Each pair is tested and packaged together using the following settings:

DRAM Clock: 200 MHz

DRAM Voltage: 2.7X Volts

SDRAM CAS Latency: 2T (2.5 on AMD platform)

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 6T

SDRAM Bank Interleave: 4 Bank

All other settings are motherboard defaults.

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+/- 0.1 for JEDEC spec = 2.50 to 2.70 volts. The XMS series is enthusiast memory and as such usually runs faster timings / speed than JEDEC specs (max is 200 Mhz, 3-4-4-8 timings).

 

The 3200C2s when used with the AthlonXP platform need to be set to CAS 2.5. Athlon64s can run them @ CAS 2.0 and are warrantied as such.

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+/- 0.1 for JEDEC spec = 2.50 to 2.70 volts. The XMS series is enthusiast memory and as such usually runs faster timings / speed than JEDEC specs (max is 200 Mhz, 3-4-4-8 timings).

 

The 3200C2s when used with the AthlonXP platform need to be set to CAS 2.5. Athlon64s can run them @ CAS 2.0 and are warrantied as such.

 

I'm confused. 2.50 to 2.70 would make 2.60 fine and I don't understand why 2.75 is recommended.

 

Let me put it this way:

 

With the ASUS A8N-SLI Premium and AMD XP 3500+ Venice core with Seasonic 600 watt PSU, what are the recommended stock settings for both the XMS TWINX2048 3200 and 3200C2?

 

I am not overclocking.

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Corsair XMS Qualification and Testing Information

 

3200:

CAS Latency (tCL): 3

RAS to CAS Delay (tRCD): 3

Row Precharge (tRP): 3

Active to Precharge Delay (tRAS): 8

 

Memory Voltage: 2.75 Volts

All other settings to defaults.

 

3200C2:

CAS Latency (tCL): 2

RAS to CAS Delay (tRCD): 3

Row Precharge (tRP): 3

Active to Precharge Delay (tRAS): 6

 

Memory Voltage: 2.75 Volts

All other settings to defaults.

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Corsair XMS Qualification and Testing Information

 

3200:

CAS Latency (tCL): 3

RAS to CAS Delay (tRCD): 3

Row Precharge (tRP): 3

Active to Precharge Delay (tRAS): 8

 

Memory Voltage: 2.75 Volts

All other settings to defaults.

 

3200C2:

CAS Latency (tCL): 2

RAS to CAS Delay (tRCD): 3

Row Precharge (tRP): 3

Active to Precharge Delay (tRAS): 6

 

Memory Voltage: 2.75 Volts

All other settings to defaults.

 

 

I read the link you provided but don't see 2.75 Volts recommended for the 3200--only for the 3200C2. So where am I missing that 2.75 recommendation for the 3200?:

 

Testing parameters for XMS3200:

 

(I can't find the TWINX 2048 version)

 

CMX512-3200 Data Sheet

CMX256A-3200 Data Sheet

Motherboard make and model: Asus P4C800/-E and/or DFI INFINITY I865/I875 and/or Asus A7N8X and/or ABIT IC7 Max3.

DRAM Clock: 200 MHz

DRAM Timing (overrides SPD values): Manual

System Performance: Normal

SDRAM Bank cycle time (or tRAS): 8

SDRAM Bank Interleave: 4

SDRAM Row Precharge (tRP): 3

SDRAM RAS-to-CAS Delay (tRCD): 3

SDRAM CAS Latency: 3

All other settings are motherboard defaults.

 

 

Testing parameters for TWINX3200C2:

TWINX2048-3200C2 Data Sheet

TWINX1024-3200C2 Data Sheet

TWINX512-3200C2 Data Sheet

Motherboard make and model: Asus P4C800/-E and/or DFI INFINITY I865/I875 and/or Asus A7N8X and/or ABIT IC7 Max3.

Each pair is tested and packaged together using the following settings:

DRAM Clock: 200 MHz

DRAM Voltage: 2.7X Volts

SDRAM CAS Latency: 2T (2.5 on AMD platform)

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 6T

SDRAM Bank Interleave: 4 Bank

All other settings are motherboard defaults.

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2.75's the tested voltage for ALL DDR1 XMS memory. Just missing from one or 2 on the list. Some motherboards don't even do 2.75, only 2.7 or 2.8. Regardless, set it to a voltage between 2.5 and 2.90. If it's stable, no worries.
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2.75's the tested voltage for ALL DDR1 XMS memory. Just missing from one or 2 on the list. Some motherboards don't even do 2.75, only 2.7 or 2.8. Regardless, set it to a voltage between 2.5 and 2.90. If it's stable, no worries.

 

What would you suggest for the command rate? 1T or 2T?

 

I also would like to know which memory you suggest: the TWINX2048 XMS3200 or TWINX2048 3200C2PT for the ASUS-SLI Premium?

 

I don't overclock and don't play any intensive 3D games, just chess and baseball. The price difference between those memory choices is not a factor. What I am interested in is stability and performance with stability the main factor.

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