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TwinX1024-3200C2PT problems@1T


jfrog

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I'm running a Gigabyte K8NS-Ultra 939 with an Athlon64 3500+ Clawhammer 939, BFG 6800GT OC and Enermax 470w power supply. At 2T timing, the system is rock solid stable, but the system becomes unstable if I try to run the TwinX1024-3200C2PT at 1T timing.

 

Mem settings:

Cas# Latency: 2.5

Row Cycle time(tRC): 11

Row Refresh cyc time(tRFC): 13

RAS# to CAS# Delay(tRCD): 3

Row to Row Delay(tRRD): 3

Min RAS# active time(tRAS): 6

Row precharge time(tRP): 3

Write recovery time(tWR): 3

Write to Read delay(tWTR): 2

Read to Write delay(tRWT): 4

Refresh period(tREF): 2x3120 cycles

1T/2T DRAM Timing: 2T(1T causes system instability)

 

Ram running @2.7v (set to +0.2v in BIOS)

Motherboard running latest BIOS.

 

Final note: Prime95 halts with FATAL HARDWARE ERROR if I try to run 1T timing

 

Any suggestions?

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I looked at the recommended settings:

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

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.

 

According to the above, I should leave the command rate in the BIOS set to Auto(that is the default), and it seems to run stable this way.

Current settings:

Cas# Latency: 2.5

Row Cycle time(tRC): 11

Row Refresh cyc time(tRFC): 13

RAS# to CAS# Delay(tRCD): 3

Row to Row Delay(tRRD): 3

Min RAS# active time(tRAS): 6

Row precharge time(tRP): 3

Write recovery time(tWR): 3

Write to Read delay(tWTR): 2

Read to Write delay(tRWT): 4

Refresh period(tREF): 2x3120 cycles

1T/2T DRAM Timing: Auto

DDR voltage set to +0.2 in BIOS.

 

So,this RAM not supposed to run 1T command rate?

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Yes, I have the latest BIOS, I downloaded and flashed yesterday. When I set that setting to 1T, the system becomes very unstable and sometimes BSOD's during boot. I also had a problem with this exact RAM in an A7N8X-E Deluxe. I tried different voltages and switched the RAM around in it's slots several times, still no luck. System runs stable at 2T or Auto(BIOS default). I even reset the CMOS several times.

 

EDIT: Set to 1T, system booted fine but Prime95 failed :(:

 

FATAL ERROR: Rounding was 0.5, expected less than 0.4

Hardware failure detected, consult stress.txt file.

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I'll try that.

 

Anyways, I popped my modules into a friend's MSI K8N Neo2 Platinum @ 2.5-3-3-6@1T, 2.7v and the system ran stable. I'm probably gonna switch to a MSI board anyways, as I hear they are pretty good. Anyways, I set the memory to BIOS defaults and my system now runs stable.

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Update: Got my ram to run Prime stable with 1T command rate @196mhz.

 

I popped in some XXXX Dual Channel 512mb kit from a friend and it ran Prime stable at 2.5-3-3-6, 200mhz, 1T command rate.

 

I read some threads on other forums about the Gigabyte K8NS-Ultra 939 being picky with ram. It seems to not like my Corsair for some reason...

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Problem solved...

 

My A64 3500+ Clawhammer had a bad onboard memory controller.

 

Story is, I was having the same problems with my MSI K8N Neo2 Plat.(i bought this thinking my Gigabyte was messed up). As soon as I got my hands on a used A64 3500+ Winchester, no more problems :sunglasse . I RMA'd the bad chip back to AMD, should get it in a few weeks :biggrin:

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