Overclock.net › Forums › Components › Memory › Strange OC results with G. Skill 6400 HK's
New Posts  All Forums:Forum Nav:

Strange OC results with G. Skill 6400 HK's

post #1 of 7
Thread Starter 
I just built a new rig last week and I've been in the process of finding a nice OC for it. Running e6300, P5B Deluxe, 2Gb G. Skill 6400 HK's. I admit I've been out of the loop for awhile on OC'ing so it took a bit to get back into the groove of things.

So far thet best OC I've gotten which I'm probably going to run with if I can't figure out what is causing some of strange results is:

375Mhz - FSB
1.3125v - vCore
938Mhz - Mem
2.25v - Mem Voltage
4-4-4-12 timings (still tinkering around with the timings)

This seems to run very stable giving me great performace and good benchmarks, but on to some things that seemed strange to me and I might just not be up to date on all my knowledge on OC'ing a lot of the newer hardware.

The first OC I tried on my processor (going by some of the success from others with my same CPU) was 400Mhz FSB with a 1:1 dividers so my RAM was running back at stock speed, and it ran Orthos CPU stress fine for 12 hours, and ran CPU/mem stress fine for 6 hours. However, it fails in Memtest86 and my 3Dmark06 score was really low. It seems strange to me that in Memtest86 I can run flawlessly with the RAM OC'ed by over 100Mhz (938Mhz) with the cores running at 2.625Ghz, but when I have the RAM running at stock speeds and 4-4-4-12/5-5-5-15 timings on various voltages with the cores at 2.8Ghz I get a lot of errors.

Also for no additional cooling on the RAM besides air flow from the case, what would be the max recommended voltages on the RAM for 24/7 use? I see some people that won't go above recommended and others that will go as far as 2.3-2.4v. The Hk's are rated 2.0-2.1v.
Uchikoma
(9 items)
 
Tachikoma
(22 items)
 
 
Reply
Uchikoma
(9 items)
 
Tachikoma
(22 items)
 
 
Reply
post #2 of 7
One thing you'll have to remember about your motherboard, is that it has a 0.05v Vdimm droop, so technically that 2.25v is 2.20v and 2.20 may be a little too low for that RAM, try a 2.30v that way it'll default at 2.25v.

I have that same HK kit and I'm able to hit 1000mhz with the stock 4-4-3-5 timings: Testing: G.Skill HK DDR2 800 @ 1000mhz 4-4-3-5 | 2.30v

BTW, I set the voltage to 2.35v in the BIOS and as you can see, it shows as 2.30v.
post #3 of 7
Thread Starter 
Tried both 800Mhz and 1000Mhz at 2.35v and always get errors at end of test 5 on Memtest. I've been wondering, though, I have the FSB voltage, NB VCore, SB VCore, and ICH all on Auto. I don't know what these really do, and I've not seen too much info on what I should be doing with them. You seem pretty knowledgable from the posts I've seen from you, maybe you can shead a little light for me. Could these be what's holding me back?
Uchikoma
(9 items)
 
Tachikoma
(22 items)
 
 
Reply
Uchikoma
(9 items)
 
Tachikoma
(22 items)
 
 
Reply
post #4 of 7
When I hit the 1,000mhz with my HKs, I didn't have to tinker with the voltages on the NB nor SB, just timings and voltage on the RAM.

Unfortunately you may have a bad module and that's why you get errors but......

How stable is the system overall? Can you finish a PCMark05 or what's your 3DMark06 score? And which video card you have installed in that system?
post #5 of 7
Thread Starter 
Stock, the modules run at 4-4-3-5 on normal volts. I was playing around and I can get it to do 390 FSB on 4:5 divider 9XXMhz (forgot the number exactly) at 5-5-5-15 with no errors. Anything higher I get a large number of errors at the end of test 5. I didn't play the timings on 390 because I've been more focused on getting 400 FSB on stock RAM clock speed.

I'm running an eVGA 8800GTX. With the OC I listed in my initial post I can rock about 11k on 06 and it's very stable. I don't have 05 installed at the moment. I mean, that OC isn't bad by any means. I just found it strange I can hit such high speeds on my RAM but once I try 400 FSB (which looks to be stable after 12 hour Orthos) I can't get the RAM stable at stock speed with slower timings.
Uchikoma
(9 items)
 
Tachikoma
(22 items)
 
 
Reply
Uchikoma
(9 items)
 
Tachikoma
(22 items)
 
 
Reply
post #6 of 7
I'd say RMA time, you shouldn't be running them with CAS 5, they're rated for 4 and if they can't do 4-4-3-5 at all stable? RMA I'd say. Well, I would.
post #7 of 7
Thread Starter 
Yeah, it's RMA time. I just took a stick out and ran one at 4-4-3-5 at 1000Mhz. Thanks for the help.
Uchikoma
(9 items)
 
Tachikoma
(22 items)
 
 
Reply
Uchikoma
(9 items)
 
Tachikoma
(22 items)
 
 
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Memory
Overclock.net › Forums › Components › Memory › Strange OC results with G. Skill 6400 HK's