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Memory Timings

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August 24, 2011 7:26:40 PM

I have 2 sticks of 4gb g.Skill DDR3 1600MHz memory. Manuals suggest stock settings should be @ 1.5v and timings at 9-9-9-24. Have not been able to create a stable environment with the stock settings so I've been trying to tweak them. So far I have tried 9-9-9-21, 8-8-8-21, 7-7-7-20. I am not an expert at all regarding timings of DRAM so I would like some help with this. My biostar A880G+ supports up to 1333MHz and that is what I set my RAM to in the bios. I've had BSOD's and 'hyper transport flood sync' errors for the past few weeks. I have my CPU running stable and my memory was checked individually with MEMtest. I just need a little help tightening up my timings so I can run a full torture test.

CPU Voltage: 1.4375
CPU Clock Speed: 3.8ghz
Core multipler: x19
FSB : 200MHz
RAM Timings: 9-9-9-24
NB Voltage: 1.1875
HTL Speed: 2000MHz


More about : memory timings

a c 347 } Memory
August 24, 2011 7:35:18 PM

If you want an AMD to use 1600 MHz RAM then first set the DRAM Frequency -> DDR3-1333 MHz, next the FSB to 240MHz this should cahnge the DRAM Frequency to DDR3-1600MHz, and the CPU Multiplier -> 16 for 3.84GHz. Use the Rated Frequency, CAS Timings and add Command Rate 2N to your environment. Double-check the values then Exit & Save = Yes.

CPU:
3800 MHz @ 200MHz FSB; CPU Multiplier = 19
3840 MHz @ 240MHz FSB; CPU Multiplier = 16


IF needed increase both the DRAM Voltage +0.05v over stock and CPU NB {aka VID} Voltage to 1.30v; not to be confused with Chipset's {NB Voltage}.

The FSB should fix the problem.
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August 24, 2011 9:38:38 PM

I tried all that you suggested. small fft's test on Prime95 ran for about 3 minutes then crashed to black screen and reboot. When upping the FSB that much I was running speedfan and was getting 60 degree temps on my cpu. All other times I've ran it I stayed in low 50's. I will eventually be getting some sort of water cooling system but for now, I'm wondering if temperatures are an issue. I have it to turn off at 80 in bios I think but I don't know what else this issue could be.
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August 24, 2011 10:44:32 PM

Large fft's runs fine for hours on end. Small fft's freeze up and shuts down computer. This means its gotta be something on the north bridge side. CPU or NB itself... not sure though.
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a c 347 } Memory
August 25, 2011 12:13:20 AM

The settings I posted have blinders to your RAM only, running your CPU at 3.8GHz is completely separate. I assume once you increased the FSB to 240MHz you decreased the CPU multiplier to 16 or less otherwise you increased you OC even higher i.e. added heat.

There's plenty of OC posts for your AMD, the problem is low Phase MOBOs like your Biostar A880G+ produce higher than necessary vCore, and higher vCore = higher heat.

On your CPU isolate the RAM first, set the CPU Multiplier -> 13 or 14 with a FSB of 240MHz get the RAM perfectly stable at 1600 MHz then start 'tweaking' the CPU OC.



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August 26, 2011 12:40:29 PM

I am running stable at 3.6ghz right now. Well, I wouldn't call it stable exactly. I ran AOD's stability test for 12 hours fine. Once I run prime95 is when I hit problems. I get shutdowns after about a half hour. I am assuming it is due to heat since my CPU gets up to around 62 degrees and thats when I get the shutdown. I will be upgrading my motherboard shortly and will be purchasing water cooling supplies.
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a c 347 } Memory
August 26, 2011 2:05:33 PM

It depends on 'what' Prime95 tests you're running. The Blend is more about RAM including a bad stick or not using Command Rate = 2. Otherwise Test 7 failure is more about the CPU IMC so FSB or BCLK increases are warranted.

A 3.6GHz~4.0GHz+ on a 6-core is pretty easy with a good HSF. Keep in mind parroting OC settings in particular for the CPU isn't a good idea, instead in particular the voltages vary according to the quality of the MOBO itself; i.e. better quality MOBO with high number of phases yields lower vCore voltage where are 4+2 yield higher vCore AND higher voltages = higher heat. ;) 

The Biostar A880G+ appears to be basic 4+1 phase and isn't designed for high nor long-term OC -> http://www.biostar.com.tw/app/en/mb/content.php?S_ID=49...

Example note correlation high phases = low vCore - http://www.overclock.net/intel-motherboards/916189-comp...
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August 26, 2011 2:42:57 PM

Thanks jaquith,

A lot of useful information right there! I will be upgrading my motherboard like I said shortly. I will also be buying a new PSU (currently running 6 yr old CoolerMaster) and probably another 6850 and a 120 gig SSD. Any personal recommendations for a board that would work well with the 1090T. I bought this biostar a while back just for the price it was at. (49.99) I'm looking to spend around 150 dollars when upgarding my board. I know its not going to get me the best of the best, but it should get me something nice, and much more suitable for overclocking.

I didn't even plan on overclocking this system. Everything was running fine at stock. It all started with a hyper transport sync flood error. System was not stable, never. That error happened over night while I was sleeping and I'm pretty sure happened in a Windows update. Anyways, couldn't recover from the error and just started tweaking around with overclock settings to see if I could get it back. Finally!

Thanks for all your help. Looking forward to your suggestions. (sorry if I'm a bit chatty) :pt1cable: 

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August 26, 2011 2:47:10 PM

I also couldn't help but notice that our Quotes under our names couldn't be anymore opposite from each other. HAHAHAHAHA.
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a c 347 } Memory
August 26, 2011 3:15:06 PM

A 'hyper transport sync flood error' is due to vDroop which can be caused from loads exceeding the PSU, improper 'Auto' voltages, and frequently are corrected by a BIOS update. As I first posted 'DRAM Voltage +0.05v over stock and CPU NB {aka VID} Voltage to 1.30v' - increase the voltages manually and keep the FSB at 200 MHz.

If by 'Finally!' means it's fixed then leave it!!!

I wish I could say $150 guarantees a really low vCore it does not, and the AM3+ for high CPU OC

$150 GA-990FXA-UD3 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$190 GA-990FXA-UD5 (good OC AM3+) - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Side-by-Side http://www.newegg.com/Product/Productcompare.aspx?Submi...|13-128-514^13-128-514-TS%2C13-131-754^13-131-754-TS%2C13-131-735^13-131-735-TS%2C13-128-509^13-128-509-TS

Motto - if you push your rig to its' fullest potential then you better be Doing It Right or don't be surprised when it fails. Yep Extreme = Money $
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August 26, 2011 3:54:59 PM

yeah its not fixed. after not seeing the error for some time, I just played for an hour on BC2 and got the error again. screen froze up and went to reboot. got the error. I am trying your advice. Had NB set at 1.3v and DRAM was set to 1.6 (1.5 default). My RAM is rated at 1.5v how high is too high to test? Also, I have my NB speed set at 2.6ghz and my HTL set to 2ghz. should those be lowered?
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a c 347 } Memory
August 26, 2011 3:56:56 PM

Again, remember the DIFFERENCES in NB Voltage and CPU NB Voltage {aka VID}; they are NOT the same!!!
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