Jump to content
Corsair Community

Bad stick(s) of CMX512-3200C2PT?


dtaylor1984

Recommended Posts

I noticed a few crashes on a fresh O/S install on my new build, so I ran memtest86 for about 8 hours and when I came back it had found a number of single bit errors.

 

I'm running at mostly stock BIOS settings (no dynamic overclocking, etc), memory settings are manually set to:

 

2.5-3-3-6 1T, Vdimm=2.75V

 

Using TWINX1024-3200C2PT (which I beleive is just two tested CMX512-3200C2PT dimms). They're in slots 1 & 3.

 

Test Failing

.Pass Address

5 11 0x0003047ab38

5 11 0x0003147a138

8 12 0x00036f6a338

8 12 0x0003b07a338

8 12 0x0003c76a338

8 12 0x00033c6a338

 

All 6 errors were in bit 7 (0x00000040). Since they're all in the 772-967MB range, and also all end in ...38 I suspect they may all be on the same stick, but I've no idea how the BIOS interleaves banks.

 

Any suggestions?

 

(Edit: oops, I thought I was posting this in the Compatibility forum, but I guess it fits here too)

 

(Update: after leaving memtest86 running overnight, it found a large number of other errors, all still appear to be in bit 7)

Link to comment
Share on other sites

OK, some more debugging info:

 

Both modules are CMX512-3200C2PT XMS3302V5 0449107-5

(XMS3200 512MB 400MHz CL2)

 

I've now tried swapping the two dimms, which had a limited effect (the low-order bits of the address, which usually seem to match are now different).

 

Next I ran the sticks one at a time. Stick 'A' failed memtest86 rapidly (it seems to be generating more errors than before. Still always the same bit in error (0x00000040). Although I've not written them down every time to be sure, it also appears to always be the same low order bits in error.

 

Stick 'B' has now been running memtest86 for 2 passes with no errors (Stick A now fails consistently in under 30 seconds!). I'm not expecting any errors from it, however, I'll leave it going overnight and report back if it fails too.

 

But given that:

 

a) I'm fairly certain my BIOS settings are right.

b) Stick 'B' seems to be fine.

c) Stick 'A' fails on its own, or in a pair in either socket.

 

It seems logical to me to conclude Stick A is not quite performing to spec so I should RMA it (either to you or where I bought it). A second opinion would be nice though.

Link to comment
Share on other sites

  • Corsair Employees

Please make sure that you have the latest BIOS for your MB installed and that you have the modules on either slots 1&3 or 2&3; load Setup/optimized default settings, and try the following BIOS settings;

VS1GBKIT400 or VS512MB400

Advanced Chipset Features (Ctrl + F1)

DRAM Clock: 400 MHz

Configure Dram timing by SPD: Disabled/User define

SDRAM CAS Latency: 2.5T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 8

SDRAM Burst Length: 8

SDRAM Bank Interleave: 4/Auto/Enabled

SDRAM Command Rate: 2T

Frequency Voltage Control

CPU Freq: 200

Memory or Dim Reference voltage: 2.7/2.75 Volts (+.2)

AGP Voltage: Default *unless you have ATI 9200 or 9600 then 1.6 Volts suggested!*

All other settings should be set to default settings!

Then please test them one at a time with http://www.memtest.org and let’s make sure it's not some other issue! I would run the test for at least 2-3 passes to be sure!

Link to comment
Share on other sites

Please make sure that you have the latest BIOS for your MB installed and that you have the modules on either slots 1&3 or 2&3; load Setup/optimized default settings, and try the following BIOS settings;

VS1GBKIT400 or VS512MB400

.

.

SDRAM CAS Latency: 2.5T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 8

SDRAM Command Rate: 2T

 

Are you sure you cut 'n' pasted the right settings there? I sure hope TWINX1024-3200C2PT isnt the same as VS1GBKIT400, since it cost me extra!

 

Anyway, with the above BIOS settings (and/or 2.5-3-3-6 1T) I still get errors on memtest86 (this time, it found about 100 in 10 seconds), but only on that stick, regardless of which slot it's in.

Link to comment
Share on other sites

  • Corsair Employees

Sorry about that, you are corrrect with the timings. Lets get both of your modules replaced.

Please follow the link in my signature “I think I have a bad part!” and we will be happy to replace them or it!

Link to comment
Share on other sites

Sorry about that, you are corrrect with the timings. Lets get both of your modules replaced.

Please follow the link in my signature “I think I have a bad part!” and we will be happy to replace them or it!

 

 

Heh, no problem. Thanks for the help. I've requested an RMA to the retailer, which will hopefully fix the problem!

Link to comment
Share on other sites

Archived

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

×
×
  • Create New...