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AMD FX (Bulldozer) Owners Club! - Page 550

post #5491 of 8112
Seriously Lordred? I had not heard that there were sometimes diminishing throughput yields related to higher NB speeds on an FX.

BRB, I will give it a try a notch lower.

Results:
440

It went down about .2 GB/s for me when I went with a lower NB. I have tried to get higher than 2600, but this is the highest one that is stable so far, and I have not yet tried upping the CPU/NB voltage or anything yet. This MaxxMem looks like it went way down from the 12.3 GB/s screen I posted earlier, but actually I was tinkering last night and when I tested before shutdown I had 11.9 GB/s on the MaxxMem score before I switched to a lower NB.
Edited by Jagged_Steel - 7/16/12 at 9:52am
    
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post #5492 of 8112
This is not going to be the case for every CPU because each CPU will respond differently to the same clocks and voltages.

Straight from the Bulldozers OC Guide
http://www.overclock.net/t/1140459/bulldozer-overclocking-guide-performance-scaling-charts-max-ocs-ln2-results-coming
cpunb.jpg

He was showing negitive scaling most of the time beyond a NB of 2400-2500.
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post #5493 of 8112
I was hoping it would be the case for me too, but it looks like 2600 is the best NB for me right now. It is awful, muggy, nasty, out today.Therefore I am going to be a chairhound and tinker some with the new FX . I was up @ 4 a.m. screwing down a deck this morning, I think screwing off the rest of the day is in order. First I am going to explore my max multi I can get with a 200 bus.

Results with all auto voltages and memory /nb settings:

200x23= Good
200x23.5=Good
200x24=Good
200x24.5=Booted, then crashed
200x25=No Boot
200x25.5=Clear CMOS time. weirdsmiley.gif

Glad I picked up a switch that mounts in a blank slot on the back smile.gif. The CMOS jumper on this M5A97 became extremely tricky to reach after I added my second 6790. It could be done, but it was ship-in-a-bottle type stuff using a long stick with a slot cut in the end of it to pull that thing off and then touching the pins with a long screwdriver to clear.

On a lark I decided to try a real high bus. I set 260x16 and the FX fired right up! It is "only" running @ 4174 at those settings, but I am still impressed. thumb.gif

Going to go walk the multi up and see how far I can go with that high of a bus. This Samsung seems to prefer a high bus, at least it did on my 555, it was best at 244 which was the sweet spot bus speed for it. The FX hitting 260 is well, FAST ! thumb.gif

440

260x19= 4.95 Ghz on the stock cooler with auto voltages thumb.gif This is auto memory settings. I made one attempt at setting it 8-8-8 but it failed. I managed to get 8-8-8 one multi lower @ 260x18.5. I will try and zero this thing in.

Update:Decided to pursue the 260x18.5 settings as I was able to get 1700+Mhz 8s on the Sams there. I pushed the bus up 2 at a time until it failed @ 268. 266x18.5 appears to be stable.
440

Still havn't seen the magic 5 Ghz yet, but I am pretty sure I can get there. I upped the auto-settings levels a bit to high/120%.
Edited by Jagged_Steel - 7/16/12 at 1:12pm
    
CPUMotherboardGraphicsRAM
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2x Corsair Force 3 120 GB SSD External USB AMD stock cooler Win7 Ultimate 
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post #5494 of 8112
mad.gif really wanted 4 or 4.1ghz outta my 8120. i can only get it to x18 (3.6ghz). thats where under prime95 it gets to 61c on the dot. guess ill have to deal with this.
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post #5495 of 8112
Quote:
Originally Posted by Lordred View Post

This is not going to be the case for every CPU because each CPU will respond differently to the same clocks and voltages.
Straight from the Bulldozers OC Guide
http://www.overclock.net/t/1140459/bulldozer-overclocking-guide-performance-scaling-charts-max-ocs-ln2-results-coming
cpunb.jpg
He was showing negitive scaling most of the time beyond a NB of 2400-2500.

I didnt see any FX 81xx chip wich could operate full srtess test stable @4.5Ghz with only 1.3V ?????
post #5496 of 8112
diffently need some cooling
post #5497 of 8112
Quote:
Originally Posted by itomic View Post

I didnt see any FX 81xx chip wich could operate full srtess test stable @4.5Ghz with only 1.3V ?????

and what do you consider full stress?
post #5498 of 8112
i cant run my 8120 @ 4.5ghz at 1.3V and my max NB is 2400mhz. 2600 wont boot. and i increased cpu/nb voltage to 1.3V im not wanting to go water cooled, i thought my thermaltake clp0554 was gonna be good enough. but it is 82F in my house as of now.
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post #5499 of 8112
Quote:
Originally Posted by bf3player1978 View Post

i cant run my 8120 @ 4.5ghz at 1.3V and my max NB is 2400mhz. 2600 wont boot. and i increased cpu/nb voltage to 1.3V im not wanting to go water cooled, i thought my thermaltake clp0554 was gonna be good enough. but it is 82F in my house as of now.

@ 4.5GHz with only 1.3V you aren't running stable and it will fail as soon as you push all the cores to 100%
post #5500 of 8112
Quote:
Originally Posted by Bubba Hotepp View Post

@ 4.5GHz with only 1.3V you aren't running stable and it will fail as soon as you push all the cores to 100%

yep i know. my system is at its max. i cannot get any higher clocks w/o overheating is 3.6 really that bad?
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