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Phenom II steppings and max OC 550-940 - Page 138

post #1371 of 2829
Added info on mine. Stepping is CACVC AC 0851APBW All the CPU-NB, NB, and HT volts are stock. Which might be why my max is only 3.7, lol.

Whats the difference between the CPU-NB and the regular NB voltage. I've seen them but wasn't sure which one to adjust accordingly.
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post #1372 of 2829
Quote:
Originally Posted by Lxcivic2k1 View Post
Added info on mine. Stepping is CACVC AC 0851APBW All the CPU-NB, NB, and HT volts are stock. Which might be why my max is only 3.7, lol.

Whats the difference between the CPU-NB and the regular NB voltage. I've seen them but wasn't sure which one to adjust accordingly.
NB voltage correlates to your NB core (chipset bridge), so adjusting that can make your NB core OC more stable (in theory). Your CPU-NB voltage is the voltage of the NB in the CPU, assuming I have read things correctly. I haven't had a chance to play around with those enough to tell you much more regarding what little voltage tweaks to each will do for system stability in your OC's.
    
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post #1373 of 2829
First post here. Just built a new system, specs below.

Got it stable at 3.5, completed 24 hours of prime95 blend error-free. Can't get it to 3.6 at all, crashes Vista in the first minute of running prime95. Stable settings are:

226 X 15.5 = 3503
Vcpu = 1.375v
NB Multiplier = 8, NB freq = 1808

Everything else stock.

Memory @ 5-5-5-15-26-2T clocked @ 904 @ 2.1v

Not the fastest OC but stable even with 4 memory sticks. Temps are good, ambient was 22-25C during prime95 test, cores idle @ 34-35C, 46-48C spiking to 50-51C under prime95 full load. MB temp @ 28-30C under load.

GPU temps sucky, with stock cooling no-load idle temp @ 51-53C. Ran a couple of cycles of furry donut, best time finished at 106C. Ordered copper VGA heatpipe cooler & heatsinks, will tear down the vid card next week.
Edited by PatrickD - 3/5/09 at 9:33pm
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post #1374 of 2829
PatrickD, you may have to go with a higher Vcore then 1.375. Try bumping it up to 1.4volts and start testing again.

Those GPU idle temps look about right for the 4870. Idle temps are actually lower then expected but full load is way up there. What cooler did you order for your card? I had the Thermalright V2 on my 4850 and I really got some nice results with it.

Good luck
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post #1375 of 2829
Bumped Vcore to 1.4 and the CPU multiplier to 16 = 3616, left all other settings the same. It's been running prime95 for about 30 minutes, looks like the higher Vcore did it. I tried the same test earlier but set Vcore to 1.3875, prime95 still crashed it, so 1.4 is right on the edge. Core temps are up a bit, idle is 40-41C, prime95 test has them at 50-51C and will probably go higher after a few hours. Nice to know that it'll run at 3.6, but I think for normal use I'm going to leave it at 3.5. I'd rather have the lower temps than the extra speed.

For the VGA cooler I orderd a Zalman VF1000 & since it come with aluminum heatsinks for the memory chips, also ordered Swiftech MC14 copper heatsinks. The vid card will probably weigh 3 lbs when it's all installed, if it doesn't work and the GPU frys at least it'll have scrap value

OK, just as I was about to post this the new box rebooted. So prime95 crashed it after about 50 minutes. Vcore @ 1.4 is marginal, 1.4125 or 1.425 is probably about right.
Edited by PatrickD - 3/6/09 at 12:12am
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post #1376 of 2829
Quote:
Originally Posted by PatrickD View Post
GPU temps sucky, with stock cooling no-load idle temp @ 51-53C. Ran a couple of cycles of furry donut, best time finished at 106C. Ordered copper VGA heatpipe cooler & heatsinks, will tear down the vid card next week.
The 48xx GPUs generate a lot of heat and can run at high temps, but Furmark is actually unsafe to run - 106c is way too high. From researching this issue a bit, the kind of load furmark generates is just inherently unsuitable for the design of these cards, and even with an aftermarket cooler, you should use a different benchmark. ATI actually tries to throttle Furmark, but Furmark installs the .exe under a different, random name to work around that. Regardless, I wouldn't run Furmark even with additional cooling - it instantly shoots my GPU temp to 20c higher than even GPU OCed gaming load.
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post #1377 of 2829
My system seems stable at 3580mhz (FSB=224mhz) at 1.4v, but the memory bandwidth is compromised. I'll continue running at 3500mhz at 200mhz FSB. 224/226mhz FSB seems to be the happy spot for stability, but at the best you save 0.025v.

Thermal compound has set and I idle at 38C and load at 55C after an hour.
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post #1378 of 2829
Quote:
Originally Posted by PatrickD View Post
OK, just as I was about to post this the new box rebooted. So prime95 crashed it after about 50 minutes. Vcore @ 1.4 is marginal, 1.4125 or 1.425 is probably about right.
PatrickD, try 1.425 volts first and see if that gets you through Prime 95. There are a few members on the rosters that are running about the same clock speed and voltage. Others were lucky enough to hit 3.7+ Ghz with the same voltage.

Good luck

Quote:
Originally Posted by experimental View Post
From researching this issue a bit, the kind of load furmark generates is just inherently unsuitable for the design of these cards, and even with an aftermarket cooler, you should use a different benchmark. ATI actually tries to throttle Furmark, but Furmark installs the .exe under a different, random name to work around that. Regardless, I wouldn't run Furmark even with additional cooling - it instantly shoots my GPU temp to 20c higher than even GPU OCed gaming load.
Experimental, wouldn't putting 100% load on the card be a good way to test for stability or is it just not even required? I would be interested to see what effect Furmark has on the card after a vga cooling upgrade.
Edited by thlnk3r - 3/6/09 at 9:06am
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post #1379 of 2829
Quote:
Originally Posted by experimental View Post
The 48xx GPUs generate a lot of heat and can run at high temps, but Furmark is actually unsafe to run - 106c is way too high. From researching this issue a bit, the kind of load furmark generates is just inherently unsuitable for the design of these cards, and even with an aftermarket cooler, you should use a different benchmark. ATI actually tries to throttle Furmark, but Furmark installs the .exe under a different, random name to work around that. Regardless, I wouldn't run Furmark even with additional cooling - it instantly shoots my GPU temp to 20c higher than even GPU OCed gaming load.
I agree. I ran the furmark stability test with the temperature graph showing, watched as the GPU temp kept climbing and the numbers turned red. The app has no failsafe built in to cut it off before the card cooks itself, it will cheerfully chug along until your GPU and memory ignite I finally killed it manually when the temp rolled over 100C. I've read comments on Newegg where people have destroyed their vid card running furmark repeatedly. My GPU temps under the one minute benchmark test were topping out in the high 70s, low 80s -- then I enabled OpenGL triple buffering in Catalyst and it shot up to 106C at the end of the first benchmark (huge performance gain, but the screen started artifacting as graphics memory overheated, luckily it only lasted about 10 seconds). Yeah, I'm pretty much done running furmark.

Quote:
PatrickD, try 1.425 volts first and see if that gets you through Prime 95. There are a few members on the rosters that are running about the same clock speed and voltage. Others were lucky enough to hit 3.7+ Ghz with the same voltage.
I have no doubt that I could tweak volts and memory settings to hit 3.7, maybe even higher, but this box is going to be my main system for the next few years and I don't want to run it at the higher temps day-after-day. Even at Vcore 1.4, temps are starting to get beyond where I like to be. For an air cooled quad core with 4 memory sticks running Vista 64, getting the extra 0.5 boost with low temps and total stability is pretty pleasing as it is. Besides, I don't think Vcore is the whole key to stability here -- if you look at the systems that have hit 3.7+, all of them have only two sticks of memory and/or have relaxed memory timings. My memory is rated at 1066 @ 2.1v, I can't hit the 1066 mark with stability but the current settings of 5-5-5-15-26-2T @ 904 are good for an 8Gb system.

Next step is to add the cooling hardware to the vid card and see how low I can get the idle/full load temps.
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post #1380 of 2829
Quote:
Originally Posted by test tube View Post
My system seems stable at 3580mhz (FSB=224mhz) at 1.4v, but the memory bandwidth is compromised. I'll continue running at 3500mhz at 200mhz FSB. 224/226mhz FSB seems to be the happy spot for stability, but at the best you save 0.025v.

Thermal compound has set and I idle at 38C and load at 55C after an hour.
Yeah, 0.025v may not sound like much but it can lower core temps by 3C. I'm running 226 X 15.5 and idle temp at 21C ambient is 31C, fully loaded is around 44-45C. What's the room temp for your idle/load temps?
Edited by PatrickD - 3/6/09 at 10:32am
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