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Phenom II steppings and max OC 550-940 - Page 139

post #1381 of 2829
I have 3.8 Prime95 stable, here are my settings:

Multiplier-19
NB Frequency-1800mhz
Cpu Voltage-1.55
CPU/NB Voltage-1.2
CPU/VDDA Voltage-2.8
HT Voltage-1.28
NB Voltage- 1.28
NB 1.8v-1.8
SB Voltage-1.35


The CPU Voltage is 3.3% over AMD's recommended max of 1.5v.


Prime95 ran for 40minutes then I closed it (don't like watching paint dry). I'll run it again later and see if I can get a few hours out of it.
Edited by AMD2600 - 3/6/09 at 2:04pm
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post #1382 of 2829
Quote:
Originally Posted by PatrickD View Post
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?
RT is 22C here.

edit: Toyed with the BIOS:
Bus: 234mhz
Multiplier: 15x
Core: 3510mhz
VID: 1.375v
HT: 1872mhz
Memory: 936mhz

Priming now, seems stable so far.

edit 2: fail
Priming now with small FFTs ->
Bus: 232mhz
Multiplier: 15x
Core: 3480mhz
VID: 1.375v
HT: 1856mhz
Memory: 928mhz

edit 3: fail
Priming now:
Bus: 224mhz
Multiplier: 15.5x
Core: 3472mhz
VID: 1.375v
HT: 1792mhz
Memory: 896mhz
Edited by test tube - 3/6/09 at 2:45pm
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post #1383 of 2829
Quote:
Originally Posted by PatrickD View Post
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.
PatrickD, that's a good approach then. Heck I won't complain about a 500Mhz overclock. If you plan on having this machine on for 24/7 then that should get you by perfectly fine while keep the temps down. Did you end up settling with 1.375volts?

Good luck
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post #1384 of 2829
Prime95 stable for 2 hours:

Bus: 230mhz
Multiplier: 15.0x
Core: 3450mhz
VID: 1.375v
HT: 1840mhz
Memory: 920mhz
Temperature max load: 53C
Edited by test tube - 3/6/09 at 5:46pm
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post #1385 of 2829
Quote:
Originally Posted by thlnk3r View Post
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.
I agree stability testing under load is required - I just think that Furmark on the 48xx cards is a 'special case' based on a fair amount of evidence. I admit I'm not an expert but in addition to user reports of killing their cards, the fact that the ATI drivers specifically try to throttle Furmark seems to indicate this particular benchmark is much riskier than the average test. Perhaps this could be considered a design flaw, but I think the price/performance of a card like the 4870 is so good that not being able to run furmark full-out safely is an acceptable compromise. I should probably dig up a link for this, but I read some speculation that GPU cooling doesnt entirely solve the issues with 4870 cards, because it may be the test causes the cards to run too much current through some of the components, regardless of the heat.

The general issue of temps is pretty interesting, because the relatively high temp of my 4870 definitely limits the overclockability of my CPU because of its effect on the base temperature inside the case. The fact that Phenom II is so cold-loving means that I am limited much more by the thermal barrier than the hardware itself. 3.4 ghz on stock volts on the 940 BE cpu and 800 clock 1050 ram on the 4870 seems to be the sweet spot of maximum real-world gaming performance for me, without upgrading my cooling systems.
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post #1386 of 2829
i think i'm gonna get stupid now..-_-' reformatted to VistaX64 and it seems its much lamer OC..i can't hit 3.7 stable on vista64..its been really stressing me and it seems i don't get results like you do guys..tough luck eii..
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post #1387 of 2829
Quote:
Originally Posted by thlnk3r View Post
PatrickD, that's a good approach then. Heck I won't complain about a 500Mhz overclock. If you plan on having this machine on for 24/7 then that should get you by perfectly fine while keep the temps down. Did you end up settling with 1.375volts?

Good luck

yep, went back to the 3.5 settings that passed a 24 hour prime95. Now I'm loading software, starting with moving 155 Gb of data from my old workhorse to the new one. I've got to get a few games going to really shake it out -- not counting a few suicide runs with furmark, the vid card has never been tested with a realworld load.

When I started OCing this build, I looked at the spreadsheet from this thread and decided to try for 3.6 as the normal system clock. What I found out is that's totally do-able, (and then some), just not in the way that I want this box configured for everyday use.

Turns out that other than adding .025V to Vcpu, upping the FSB to 226 and setting the CPU Multiplier to 15.5, all of the BIOS settings are completely stock and mostly set to Auto -- the only other hand-set settings are for memory and those are all right off the Corsair data sheet. Basically, the Phenom II X4 940 3.0 is really close to being a 3.5 stock part. No complaints here at all.

Quote:
The general issue of temps is pretty interesting, because the relatively high temp of my 4870 definitely limits the overclockability of my CPU because of its effect on the base temperature inside the case. The fact that Phenom II is so cold-loving means that I am limited much more by the thermal barrier than the hardware itself.
experimental, I always solve this problem the same way -- a full tower case with several 120 mm fans front & back. Try to get case airflow to 50-70 cfm, a full tower gives you enough room to get the cabling routed out of the way. Here's a pic showing the layout inside my new box --



Haven't bought a new graphics card for quite a while and I was blown away by the 4870's 50C idle temp. Hitting 106C in furmark didn't do much for my confidence in the card's stock cooling either. But maybe I should hold off on changing out the stock heatpipes and see how it works under a full gaming load. Looks like 50C is about normal for a 4870 idle temp, if I can keep it to around 60-62C under full load maybe it'll be OK. The other parts are coming and I can change them out if it's running too hot.
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post #1388 of 2829
Well maybe I can get some help from this thread. I recently got my 940, and got it stable prime 7hrs at 3750, all I did was adjust the ht to 250 and set the vcore for 1.5. Now anything I try over that I get insta bsod, I have tried dropping my ht freq to 1.8, which resulted at a stable boot of 3.9, but insta reboot after 3 mins occt.

Any Ideas guys?
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post #1389 of 2829
Quote:
Originally Posted by vwgti View Post
Well maybe I can get some help from this thread. I recently got my 940, and got it stable prime 7hrs at 3750, all I did was adjust the ht to 250 and set the vcore for 1.5. Now anything I try over that I get insta bsod, I have tried dropping my ht freq to 1.8, which resulted at a stable boot of 3.9, but insta reboot after 3 mins occt.

Any Ideas guys?
Memory voltage? Usually 1.8V stock, find out manufacturer's specs for max voltage and bump it up. I run mine at 2.1V, others have reported stability with 2.0-2.02V. Going past spec max voltage usually causes more stability problems then it solves since it starts to overheat. Also, walk memory frequency back to lowest setting, like 400, and set timings to 5-5-5-18-26-2T and try your 3.9 stable boot settings again. If lower frequency and higher voltage on memory keep things stable, you can work it forward from there to find out where it breaks.
Edited by PatrickD - 3/6/09 at 9:52pm
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post #1390 of 2829
Quote:
Originally Posted by PatrickD View Post
Memory voltage? Usually 1.8V stock, find out manufacturer's specs for max voltage and bump it up. I run mine at 2.1V, others have reported stability with 2.0-2.02V. Going past spec max voltage usually causes more stability problems then it solves since it starts to overheat. Also, walk memory frequency back to lowest setting, like 400, and try your 3.9 stable boot settings again. If lower frequency and higher voltage on memory keep things stable, you can work it forward from there to find out where it breaks.
Thanks for the reply, I have mem volts set at default 2.1. I dropped from 800 divider to 667 for the 3.9 boot, as at the 3750 boot at 800 it runs my ram at stock 1000.

So basically ram is underclocked and at stock voltage and timings, and still receive reboots/ memory dumps. EDIT: under stress testing.
Edited by vwgti - 3/6/09 at 10:04pm
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