Possible Ram issue

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I recently purchased ram from ebay.

I asked the guy before hand if they were tested and he advised they were plus he has a 100% feedback of over 600 items(appears to all be IT related).

I received them the 2 x 1gb OCZ modules today and went home to put them in my machine. I put them in and the pc wont boot past windows loading screen.

all 4 sticks - restarts at windows loading screen

2 x hp stick - boot fine and works fine

2 x ocz sticks - reboots at windows loading screen

1 x ocz stick a - boot fine into windows

1 x ocz stick b - gets a bios rom checksum error

I believe that one of the ocz modules is faulty. I just want to check all my bases before going back to the seller.

All help appreciated

 

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Memtest http://www.memtest.org/

Common practice to run something like this before sticking uber ram in a server just in case its crummy. Can take a while to run though.

 

Just to add to what Skullerboyo said. Memtest is more accurate with one stick installed and you must run for several passes.

Having all four slots filled can cause voltage issues sometimes it is neccessary to set the voltage manually in the BIOS to what the RAM manufacturer states.

Having 2 different makes or speeds can also cause issues. It is always wise to run matched pairs of the same make.

If your CPU is an AMD you may have to change the memory mode to unganged.

 

It's also worth asking, are you running the command rate at 1 or 2? I have always found that with 4 dimms in a motherboard (or you're running 4gb or more) you need to run at 2T.

Also to mirror what GBL said, you need to find out what your ram voltage is and actually increase it above that (not too much or you will fry it). On 1.8v ram I have run it as high as 2.1v before because that was what was needed with 4 dimms.

I would check on the OCZ forums and see what they say about it. The guys over there know their stuff and will know what's required.

 

cheers for the replies guys.

The bios is pretty locked down by HP so not much i can change. I just dont see how it works using one the the modules but not the other one if they are the exact same.

I have also asked this on the OCZ forum and awaiting replies.

If the ram has a life time guarantee does it matter i have bought it second hand?

 

I was going to suggest you check that they are the right spec.

also that the settings on your mobo are correct.

 

Yes. the original guarantee would be void. However, most large second-hand resellers and refurnishers offer a 30 day guarantee of their own see their terms and conditions often at the bottom of the items page.

 

stop mixing makes and see what happens as I said earlier.

your HP ram may be 1.8v whilst the OCz might be 2v the mobo wont like this.

 

Just with the 2 identical modules of OCZ ram in it reboots at the windows loading screen.

with one of the modules in it it works fine running

when i put i the other ocz modules it gets checksum error and wont go any further.

the 2 hp are identical and the 2 ocz are identical, all are pc6400 800mhz.

Thats why i put what happens when i have different configuratiosn of the stick in to show what happens to rule out possibilities.

 

Download memtest86 burn to disk and check one stick for several passes (7 is around the norm) and see if any are faulty.

Are you sure OCz is 100% compatible and on the QVL list?

 

agreed, sounds like one module could be duff if you have deduced that a single module seems to be the issue.
I would use mem86 as suggested.

 

cool, i use memtest86 at work for checking laptop ram but usually do it only once

will run it a few times tonight on each of the 2 ocz sticks one at a time.

 

Yeah once is no good because memory issues are commonly intermittent.

Did you get anywhere?