I have a desktop computer that had a stick of RAM crap out on me. I individually ran tests on each of the four 2GB sticks and I identified the faulty stick of RAM. I removed the stick and booted my computer up and things were stable for a week at 6GB installed. That wasn't good enough for me since I knew I had an empty slot in my board and I've always thought 'more is better' in terms of computing.
I went to HP's website and looked up the model of my computer and pulled the 'Memory Upgrade' information out.
* Dual channel memory architecture
* Four DDR3 DIMM (240-pin) sockets
* Supported DIMM types:
* PC3-10600 (DDR3-1333)
* PC3-8500 (DDR3-1066)
* Non-ECC memory only, unbuffered
* Supports 4GB DDR3 DIMMs
* Supports up to 16 GB on 64-bit PCs
* Supports up to 4 GB* on 32-bit PCs
Armed with this information, I figured I could buy the following upgrade and simply plug it into the motherboard:
The RAM that I pulled out of the system has the following markings on each chip:
094409XXXXX (The underlined values change from CJ420, CW420, CFC20, and CTQ20)
Based on this information, I've tried doing a Parametric Search at Elpidia and I couldn't find a match. I'm not sure if the markings are 'Module' or 'Component', plus I don't know the latencies, voltage or other information to help narrow down the search. Perhaps you see something in the markings that I don't?
Bonus Points: When buying my RAM was there another factor I neglected to follow that might be causing this issue?
I did try it last night and it killed gaming performance. When I used three Elpida sticks (6GB Total) things were fine but when I did 2xCrucial/2xElpida games started performing poorly - choppy gameplay, long loads, etc. I'm not sure if there is some incompatibility like the latency or something so that's why I was looking for the exact specs on my stick so I could further track this down.
Is there some software that would tell me all the specs on the Elpida ram so I could post those findings?
Edit: Tonight I'll try to run some games with just the Crucial sticks and see if it is the combination.
I am guessing you might have 1Crucial & 1Elpida stick per channel, which will kill performance.
I can't tell this without actually seeing the inside of your computer but I would suggest putting them in like this.
CPU > Crucial > Elpida > Crucial > Elpida.
on a side note, it generally is not a good idea to mix RAM.
Especially since the Elpida is a cheaper RAM (128it) vs the 512bit crucial.
To be honest you are never going to get close to using all 8GB's from the Crucial kit. If it was me I would either get another Crucial kit if you *need* all 4 DIMMS filled, or just use the 2 Crucial chips.
After *much* digging on the interwebs I managed to dig up a manual for that board. It looks like it has a limitation that is causing your trouble.
• For dual‑channel configuration, the total size of memory module(s)
installed per channel must be the same (DIMM_A1 = DIMM_B1)
And if you have 4GB Crucial and 2GB Elpida chips your board is dropping down into single channel mode, which has half the bandwidth as dual channel.
When you have 3 elpida chips in, it is still running primarily in dual channel, because you probably do not have anything that gets even close to addressing over 4GB. (BF3 @ 1080 on Ultra only uses about 3GB including the OS)
The RAM isn't performing as well as I hoped. Upon further inspection, one of the other sticks of Ram had a sticker on it which has the codes:
2GB 2Rx8 PC3-10600U-9-10-B0
Based on this link, it looks like the RAM I had installed was running at 9-9-9 (by matching up the DJ in the second line). The Ram that I purchased was at 7-7-7, so I'm not sure if that's where the performance hiccups are at.
I downloaded CPU-Z and checked the Memory Tab while I had the new Crucial Ram installed. It reads like this:
Type - DDR3
Channels - Dual
Size - 8192 MBytes
DC Mode - Unganged
NB Frequency - 1999.9-2000.1 MHz
DRAM Frequency - 666.7 MHz
FSB RAM - 3:10
CL - 9
tRCD - 9
tRP - 9
tRAS - 24
tRC - 33
CR - 1T
The Memory that I currently have in there is the same voltage, but the timings are off. I tried booting into the BIOS to manually change the timings and get all techy but all my settings were grayed out.