How to tell if this iMac memory is bad?

[mindquest]

I have a late 2009 iMac 27" i7 (model identifier 11,1) and just bought another 8GB (2x4GB) of ram to throw into it from OWC. Here is the exact item:

DDR3, 204 PIN PC3-8500
http://eshop.macsales.com/item/Other World Computing/8566DDR3S8GP/

I pulled the old memory and only added the new memory modules to run a Memtest86 via CD boot. Since I only received 8 errors on just one test after 6 passes is that acceptable? Or I do I need to figure out which module it is and send it back?

Here is what the test showed after 6 passes at the 2 modules:

 

[mindquest]

Updated: I called OWC and they said not to worry and that I should call again if I experienced some performance issues after using this memory for awhile.

Not sure I agree, shouldn't new memory have no errors?

 

[ChrisMan287]

Stick your old RAM back in and give it a try.

 

[mindquest]

Stick your old RAM back in and give it a try.

I already ran memtest86 with the Apple ram ONLY for 8 passes and no errors.

 

[ChrisMan287]

I already ran memtest86 with the Apple ram ONLY for 8 passes and no errors.

So the OWC memory must be bad. It's strange because IIRC, they test the memory before it ships but I could be wrong.

Tell them that there should be zero errors with new memory and you'd like an exchange for new memory.