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18-07-2009, 03:31 PM
#18 (permalink)
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Well after my brief taste of
mis-matched 12GB action, I want more
So I plan to include some 12GB triple channel action in my comparison X58 triple channel kits review I have planned but as you will see from below findings some of the modules performance characteristics differed making 12GB config a bit trickier. So I'll start with testing 3x2GB configuration first on X58, then move onto the 2x2GB P55 dual channel platform for testing.
Haven't used A-Data memory since the old
A-Data PC4000 (Hynix D43) era!
They consist of 3x
4GB A-Data Xtreme Series 2000X Dual Channel kits rated at 9-9-9-24 at 1.6-1.8v. Total cost was AUD$396 for 12GB so relatively cheap per gigabyte at just under the cost of 6GB G.Skill Trident 2000Mhz C9 kits at AUD$215 per 6GB kit.
Specifications:- Module Type: 240Pin Unbuffered-DIMM Non ECC
- Capacity Available: 4GB Dual Channel Kit (2GBx2), 2GB Dual Channel Kit (1GBx2)
- IC Configuration: 128M x8
- Transmission Bandwidth: 16000MB/Sec(PC3-16000)
- Cas Latency Timing: 9-9-9-24
- Working Voltage: 1.6V-1.8V
- Lifetime warranty
Memtest86+ v4.0 Prelim Tests- Starting prelim memtest86+ v4.0 tests and interesting 4 of the 6 modules (modules #1-4) can handle 2000mhz 7-8-7-24 with 3 of them at lower QPI/DRAM but 1 needs higher QPI/DRAM (module #3).
- The other 2 modules (modules #5 and #6) error out slightly in 7-8-7-24 at 2000mhz but handle 7-9-7-24 and 8-9-8-24 better with much lower vdimm than the other 4 modules <1.62v. More testing I guess
- Pairing up modules #1 + #2 + #4 can do 2000mhz 7-8-7-24 around 1.68v. Pairing up modules #5 + #6 + #3 can do 2000mhz 7-9-7-24 at 1.62v and like lower vdimm over high vdimm.
3x2GB Config testing
With the above memtest86+ v4.0 findings, I decided to test the two 3x2GB pairings separately:
- Kit 1: module #5 + #6 + #3
- Kit 2: module #1 + #2 + #4
System:
Kit 1: module #5 + #6 + #3
Kit #1, likes lower vdimm than Kit #2 and handles 2000Mhz 7-9-7-24 and 8-9-8-24 timings well. This is very first winxp pro sp3 bench run for single Super Pi 32M - easily done at DDR3-2097Mhz 8-9-8-24 2T at 1.64v.
DDR3-2000Mhz 9-9-9-24 1T at 1.64v
(Kit 1: module #5 + #6 + #3)
Keep in mind these A-Data 2000X modules are rated for 2x2GB 2000Mhz 9-9-9-24 1T at 1.6-1.8v. The XMP profile #2 on Asus P6T6 WS Revolution sets up the system with lower bclk speed (hence low 1.35v QPI/DRAM XMP profile) with higher 12x memory multiplier 2000Mhz 9-9-9-24 1T at 1.65v with QPI/DRAM at 1.35v, but I never use XMP profiles preferring to do it all manually which is always best
Adding into the mix a 3rd 2GB module for 3x2GB configuration may usually require more QPI/DRAM (cpu vtt) and Vdimm voltage.
As you push higher bclk and memory speed and use 1T as opposed to 2T, you need more VDIMM and QPI/DRAM voltage. At 20x200bclk with 10x mem multi for DDR3-2000Mhz 9-9-9-24 1T I needed QPI/DRAM = 1.4875v and VDIMM = 1.64v and to do a slight bump in IOH/IOH PCI-E volts to 1.12v and 1.52v respectively to pass HyperPi v0.99b 8x32M Pi and Single Super Pi 32M.
Note: some i7 cpus might need slight higher vcore to pass HyperPi 8x32M, than vcore needed for LinX/Prime95
Interesting findings for me especially has I have a problematic module #3 in first kit1 which likes higher QPI/DRAM and VDIMM than module #5 and #6.
DDR3-2000Mhz 8-9-8-24 1T at 1.62v
(Kit 1: module #5 + #3 + #6)
DDR3-2137Mhz 8-9-8-24 1T at 1.64v
(Kit 1: module #5 + #3 + #6)
Will post rest of the results in A-Data's own thread here
12GB A-DATA 2000X DDR3 testing
