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memtest86+ question, how far to go to find a bad stick?

post #1 of 7
Thread Starter 
Well, My PC was acting kinda nuts lately, went to all default values no OC settings and ran prime, was getting the rounding error, loaded up Memtest86+ with all 4 sticks in and it found errors.

I'm currently doing 1 stick at a time. Now, Memtest will run indefinitely, so how far into the tests should one go to find errors and clear a stick to working status? OR is there a certain test to select that will be the quickest to find an error?


Individual Test Descriptions

Memtest86 executes a series of numbered test sections to check for errors. These test sections consist of a combination of test algorithm, data pattern and cache setting. The execution order for these tests were arranged so that errors will be detected as rapidly as possible. A description of each of the test sections follows:
Test 0 [Address test, walking ones, no cache]
Tests all address bits in all memory banks by using a walking ones address pattern.
Test 1 [Address test, own address, Sequential]
Each address is written with its own address and then is checked for consistency. In theory previous tests should have caught any memory addressing problems. This test should catch any addressing errors that somehow were not previously detected. This test is done sequentially with each available CPU.
Test 2 [Address test, own address, Parallel]
Same as test 1 but the testing is done in parallel using all CPUs and using overlapping addresses.
Test 3 [Moving inversions, ones&zeros, Sequential]
This test uses the moving inversions algorithm with patterns of all ones and zeros. Cache is enabled even though it interferes to some degree with the test algorithm. With cache enabled this test does not take long and should quickly find all "hard" errors and some more subtle errors. This test is only a quick check. This test is done sequentially with each available CPU.
Test 4 [Moving inversions, ones&zeros, Parallel]
Same as test 3 but the testing is done in parallel using all CPUs.
Test 5 [Moving inversions, 8 bit pat]
This is the same as test 4 but uses a 8 bit wide pattern of "walking" ones and zeros. This test will better detect subtle errors in "wide" memory chips.
Test 6 [Moving inversions, random pattern]
Test 6 uses the same algorithm as test 4 but the data pattern is a random number and it's complement. This test is particularly effective in finding difficult to detect data sensitive errors. The random number sequence is different with each pass so multiple passes increase effectiveness.
Test 7 [Block move, 64 moves]
This test stresses memory by using block move (movsl) instructions and is based on Robert Redelmeier's burnBX test. Memory is initialized with shifting patterns that are inverted every 8 bytes. Then 4mb blocks of memory are moved around using the movsl instruction. After the moves are completed the data patterns are checked. Because the data is checked only after the memory moves are completed it is not possible to know where the error occurred. The addresses reported are only for where the bad pattern was found. Since the moves are constrained to a 8mb segment of memory the failing address will always be less than 8mb away from the reported address. Errors from this test are not used to calculate BadRAM patterns.
Test 8 [Moving inversions, 32 bit pat]
This is a variation of the moving inversions algorithm that shifts the data pattern left one bit for each successive address. The starting bit position is shifted left for each pass. To use all possible data patterns 32 passes are required. This test is quite effective at detecting data sensitive errors but the execution time is long.
Test 9 [Random number sequence]
This test writes a series of random numbers into memory. By resetting the seed for the random number the same sequence of number can be created for a reference. The initial pattern is checked and then complemented and checked again on the next pass. However, unlike the moving inversions test writing and checking can only be done in the forward direction.
Test 10 [Modulo 20, ones&zeros]
Using the Modulo-X algorithm should uncover errors that are not detected by moving inversions due to cache and buffering interference with the the algorithm. As with test one only ones and zeros are used for data patterns.
Test 11 [Bit fade test, 90 min, 2 patterns]
The bit fade test initializes all of memory with a pattern and then sleeps for 5 minutes. Then memory is examined to see if any memory bits have changed. All ones and all zero patterns are used."
    
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post #2 of 7
i think it goes as long until you are satisfied =] haha

i usually do single stick overnight and i'm happy.

until i get more errors, then run memtest again.

one day it works fine, next day it goes splat; yay for lifetime guaranteed ram!!
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post #3 of 7
Thread Starter 
Yeah, That's what I'm trying to avoid... running it all night

I wonder if 4-5 tests in is good enough?

Hmm 3 sticks down (passed), 1 to go...

Welp... looks like it's gonna be one of those days... Tested each stick 1x1 up to test 8, all with no issues. Hmm.. Going to up the voltage to see if I had some sort of droop issue going on with all 4 sticks (8gb), I heard you can go up to about 2.2v, then I will retest with all sticks together...

Someone give me good news
Edited by porschedrifter - 4/20/11 at 12:22pm
    
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post #4 of 7
Thread Starter 
bump-esq
    
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CPUMotherboardGraphicsRAM
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Enough XSPC CPU block - Phobya pump - Lightech Water T... W 10 Pro 64 Samsung 22'' 2253BW - LG 23'' IPS 
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post #5 of 7
well if something is terribly wrong errors usually show up straight away. but if you really want to be sure then run as long as you can.

if all the singles work fine but more than 1 slot gives errors then it must be unstable due to your mobo settings.
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Samsung F3 1tB [RAID1] + WD Green 2tB [RAID5] Windows 7 [x64] Acer 24" [1920x1200] MX 5500 
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post #6 of 7
Thread Starter 
Yes, and that's exactly what it was! Not one of my sticks were bad, voltage on my CPU and DDR had to go up, that was the issue...

How odd.

But still good news!
    
CPUMotherboardGraphicsRAM
x8 AMD FX 9590 Crosshair Formula V Z Asus R9 390 Strix 8GB G.SKILL DDR3 2400 16GB 
Hard DriveCoolingOSMonitor
Enough XSPC CPU block - Phobya pump - Lightech Water T... W 10 Pro 64 Samsung 22'' 2253BW - LG 23'' IPS 
KeyboardPowerCaseMouse
Microsoft Natural OCZ Gold z1000 Fatality Thermaltake  Logi MX518 
Mouse PadAudio
Aluminum Dell XPS Behringer 192 USB mixer to Presonus Eris E5 stu... 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
x8 AMD FX 9590 Crosshair Formula V Z Asus R9 390 Strix 8GB G.SKILL DDR3 2400 16GB 
Hard DriveCoolingOSMonitor
Enough XSPC CPU block - Phobya pump - Lightech Water T... W 10 Pro 64 Samsung 22'' 2253BW - LG 23'' IPS 
KeyboardPowerCaseMouse
Microsoft Natural OCZ Gold z1000 Fatality Thermaltake  Logi MX518 
Mouse PadAudio
Aluminum Dell XPS Behringer 192 USB mixer to Presonus Eris E5 stu... 
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post #7 of 7
Glad you fixed your issue
Verde [WIP]
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i7 2600k @ 4.5gHz w/ HT ASUS P8P67 Pro Gigabyte 460GTX OC 8gB Kingston HyperX 
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Samsung F3 1tB [RAID1] + WD Green 2tB [RAID5] Windows 7 [x64] Acer 24" [1920x1200] MX 5500 
PowerCaseMouse
Corsair HX850W CM 690 II Adv [Modded] Logitech MX Revolution 
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Verde [WIP]
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CPUMotherboardGraphicsRAM
i7 2600k @ 4.5gHz w/ HT ASUS P8P67 Pro Gigabyte 460GTX OC 8gB Kingston HyperX 
Hard DriveOSMonitorKeyboard
Samsung F3 1tB [RAID1] + WD Green 2tB [RAID5] Windows 7 [x64] Acer 24" [1920x1200] MX 5500 
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Corsair HX850W CM 690 II Adv [Modded] Logitech MX Revolution 
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