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hyperx not running stable at 1600mhz (memtest)

post #1 of 8
Thread Starter 
specs are in sig rig. this is the ram:
http://www.newegg.com/Product/Produc...82E16820104223

i just installed the cpu/mobo/ram a couple weeks ago. i wanted to test the ram before i sent the rebate in for it.

ok, so i was running everything at stock settings except my vcore was set at 1.35v instead of 1.40v (the mobo auto sets it to 1.4, but i have read stock vcore for a 955 is 1.35). the ram was running at 1600mhz 9-9-9-24 (stock timings) at 1.65v (stock vdimm according to kingston). the mobo auto sets it to 1333mhz 9-9-9-24 1.545v).

i booted up memtest86+ 4.10 and got 82 errors within a few minutes. rebooted, tried again, same thing.

then i completely set the bios to default and let the mobo change it back (1.40vcore, 1333mhz, 1.545 vdimm, 9-9-9-24). 6 passes on memtest without an error.

so is it safe to safe my ram is okay? my question is, isn't my ram guaranteed to run at 1600mhz 9-9-9-24 @ 1.65v no matter what? my mobo specs say this for the memory:

DDR3 2000(O.C.)/1333/1066 (AMD AM3 100 and 200 series CPU support up to DDR3 1066MHz).

so doe shis mean that 1600mhz is actually "overclocked" in regard to the mobo, but it's stock for the memory?

thanks
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post #2 of 8
The stock vCore of a 955 depends on the chip; it may be set at 1.4V default vs. 1.35 for another chip. You should set the RAM to the proper 1600 9-9-9 1.65V setting. 1600Mhz is technically "overclocked" (going by the official 1333Mhz max spec of AMD memory controllers) but pretty much any AMD IMC can do 1600Mhz.
post #3 of 8
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
The stock vCore of a 955 depends on the chip; it may be set at 1.4V default vs. 1.35 for another chip. You should set the RAM to the proper 1600 9-9-9 1.65V setting. 1600Mhz is technically "overclocked" (going by the official 1333Mhz max spec of AMD memory controllers) but pretty much any AMD IMC can do 1600Mhz.
i tested with 1.40vcore and still get errors.
do i have to bump up the voltage of the IMC? from what i have read, the DRAM voltage makes the memory work correctly, but the IMC will need to be fed more voltage to work "overclocked" (that is, the memory's stock clocks). i haven't started reading up on my bios settings yet. if this is true, what setting would it be?
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post #4 of 8
You may have faulty memory sticks or memory slots, memtest86+ is actually not very IMC heavy at all. Try testing with individual memory sticks/memory slots to figure out where the problem is (i.e. which individual memory stick or slot)
post #5 of 8
Thread Starter 
i think i finally solved it. i did a search for the max voltage of hyperx and found this interesting note:

Quote:
HyperX DDR3* features:

* 1.7v - 1.95v voltage range for dual-channel applications for AMD based systems and Intel chipsets older than X58
* 1.65v voltage for triple-channel Intel Core i7 9xx series applications
* 1.65v voltage for dual-channel Intel Core i5 7xx series and Core i7 8xx series applications
* Currently available in speeds up to 2000MHz and kits capacities of 8GB dual-channel, and 12GB triple-channel configurations
http://www.kingston.com/hyperx/products/khx_ddr3.asp

seems as if the voltage needs to be a bit higher on amd and older intel systems. 1.65 is mainly for i5/i7's. i bumped the memory voltage from 1.65v up to 1.695v (next increment was 1.71v) and it did two error-free passes of memtest (then i stopped it). i consistently was erroring at test 5, but i'm getting no errors now with 1600mhz 9-9-9-27 @ 1.695v (also, i was never getting any unstableness in windows, just memtest errors)

so if these dimms can handle up to 1.95v, then there is some decent room for OCing then i guess.

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post #6 of 8
Though you don't necessarily need that much voltage on AMD systems, looks like that small voltage bump did it for you. I can't really guarantee that these dimms work at up to 1.95V though, I think what they meant is specific kits actually rated 1.95V. Some ICs will severely lose longetivity at 1.95V (i.e. PSC) and I really have no idea what are the ICs in this memory. But anyways, good luck
post #7 of 8
The ram should be fine at 1.7 volts. And if you have to run the ram at 9-9-9-27 then so be it. My ram (Corsair) would run at 1600 speed at 9-9-9-27 (1.7 volts) but would not even boot at 9-9-9-24. I actually have the ram downclocked to 1200 speed at the moment so that I can run it at CL7. I don't see any performance loss with the lower speed and tighter timings. So you may just have to play with things to see what actually works the best.
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post #8 of 8
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Quote:
Originally Posted by coonmanx View Post
The ram should be fine at 1.7 volts. And if you have to run the ram at 9-9-9-27 then so be it. My ram (Corsair) would run at 1600 speed at 9-9-9-27 (1.7 volts) but would not even boot at 9-9-9-24. I actually have the ram downclocked to 1200 speed at the moment so that I can run it at CL7. I don't see any performance loss with the lower speed and tighter timings. So you may just have to play with things to see what actually works the best.
yea i'm not even sure yet if i'm going to go for better timings or clocks. i was running it at 1333 8-8-8-24 1.65v the last couple days no problems. i have read that these sticks can do 1600 8-8-8 pretty easy with stock voltage. in the end though, i guess there really is no major difference besides benchmarks
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