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[Chrysalis]

So as below.

been getting weird results.

Tests I did are.

all 4 dimms memory consistency errors, removed all overclocking and set dimms back to low speed, still errors.

2 dimms, pass
other 2 dimms in same 2 dimm slots as first 2 dimms, pass
repeat test in other 2 dimm slots, fail

at this point thought slam dunk board issue.

one dimm in first of bad 2 dimm slots, pass
same dimm in 2nd supposedbly bad dimm slot, pass

ok whats going on

2 dimms in supposedbly bad dimm slots (diff 2 dimms to the pair used with failed test), pass
inserted other 2 dimms in what thought good dimm slots so now 4 total again, fail

removed one dimm so 3 dimms in place, pass.

reinstated cpu overclock and put ram back to XMP speed, pass

so I have now out of the case what may be a bad dimm.

about to do a new test now swapping out one of the 3 dimms with what I think is the bad one. if that fails I will then put the good one back in and bad out but test using the unused dimm slot, if that passes I will assume bad dimm. - both these tests failed so this is a mess 

So basically no consistent results which give clear cause of problem.

[burakkucat]

Would just like to suggest the usage of Memtest86+. 

[roseway]

I'll second that. There's nothing to beat it for thoroughness.

[Loading]

I changed the ram timings to lower values, silly thing to do but still, i can only use 1 of the 2 ram slots now as when i try to use both the computer wont boot, with or without overclock, both ram sticks are still perfect, but can only use 1 of the sticks. Must have damaged the mb

[Berrick]

burakkucat said: Would just like to suggest the usage of Memtest86+

I second that extremely good at weeding out randomly failing memory.

Loading said: Must have damaged the mb

You normally have to go some to do that.

I assume you had the AC lead out of the PSU whilst removing and adding the memory? At this point it may also be worth doing a factory default on the bios.

Whilst not common these days are the contacts in the memory slot the same color as the pads on the memory? IF they are'nt electrolysis can occur causing corrosion of the contact resulting in a bad joint.

Have you checked the Mobo for blown electrolytic caps?

[Ronski]

I assume you had the AC lead out of the PSU whilst removing and adding the memory?

I always have the power cable plugged in, but the socket and the switch on the power supply turned off, that way you can discharge static safely by touching the metal of the case.

[NewtronStar]

I assume you had the AC lead out of the PSU whilst removing and adding the memory?

I always have the power cable plugged in, but the socket and the switch on the power supply turned off, that way you can discharge static safely by touching the metal of the case.

Thats the best way Ronski.

Run memtest86+ on each dimm you would need to let it to run for 5 - 6 passes on each dimm to catch the faulty one & yes I know it takes and age for each pass, once all dimms have been checked and no errors then it points the finger at the motherboard and don't forget the Ram modules also needs to be close to the same clock frequency for Dual Channel to work.

[Ronski]

It may also be worthwhile using the Windows Memory test in addition to Memtest 86+, I have heard of rams passing memtest, but failing the WIndows test. There are also various types of test within Memtest, some of which seem to catch certain types of error more than the standard test.

[Chrysalis]

Unfortenatly I cannot get consistent results to point to one component.

eg. when testing one dimm at a time they all fine.

When testing one dimm slot at a time they all fine.

So its using a certian combination, loading the slots in certian ways is triggering the errors.

After some research it has become apparent haswell is very finnicky with ram to the point that corsair have made specific dimms for haswell stating "optimised/designed for haswell".

I ended up with buying 2 8 gig dimms and so far on my testing they ok.  Will likely sell the 4 4gig dimms to offset the cost.

Also memtest86+ didnt pick up errors on many of the combinations, hci memtest is much better at finding errors from my experience.

[NewtronStar]

Faulty Ram modules will sometimes pass the test in memtest86+ on the first run thats why 5 - 6 passes is required, this has happened to me many of times with memtest86+ it depends on the severness of the fault on the dimm, the faults seem to show up better when the dimm is stressed via higher temperatures.

[Chrysalis]

the dual dimm setup I am using now seems fine.

the 4 dimms are fine in the old rig as well as when tested seperatly, they are not faulty.  I even spent 2-3 hours getting the old rig in an operational state to specifically test them.

personally I dont rate memtest86+ at all, last night it passed with 17 passes when left for many hours. hci memtest then failed within 10 minutes

hci is superior as its testing with the OS up and running, its a more realistic mode which also generates more stress.

[Ronski]

Using all four slots does put more stress on the motherboard, I remember when I was over clocking my current rig people said it was easier to get better results with only two sticks of memory.

Out of curiosity what's the specs of your new rig?

[Chrysalis]

asus z87-plus 1504 bios
haswell i5 4670k currently I set turbo to 4.3ghz all 4 cores using adaptive voltage offset of 0.05v - cooled by arctic freezer i30 cooler
16gig ram via 2 8 gig vengeance dimms 1600CL9
evga 760GTX SC ACX
fractal R4 case.
onboard intel nic

carried over following from old rig.

coolermaster silent pro M 600W psu
asus xonar D2X soundcard
samsung 830 128 gig ssd
2x WD red 3TB hdd
WD green 2tb hdd - disabled auto head parking to preserve longevity
WD 640gig black hdd
samsung 750gig spinpoint f1 hdd
pioneer dvr-216d dvd burner

I agree on the overclocking and 4 dimms but sadly this wouldnt even work right at stock clocks/voltages.  What stopped me returning the board is the plain hassle involved in removing all components and rebuilding again, this cooler is a job and a half to fit.

[Ronski]

Nice setup, should certainty be quick, hope you've got your ram problem sorted now.

[Chrysalis]

yeah thats fine now, sorting small isues on audio card.