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3800X2 vs Opteron 170 Any gain to be had?

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January 20, 2007 1:03:05 PM

I currently have a 3800X2 and considering buying an opty 170 as a final upgrade to MSI RD480 Neo2 F1 Socket 939 Mobo.

I can OC the 3800 to 2.2 with reasonable stability, but no further.
Is the Opty worth it, and how high can it be OC'd??

Any help or comments are welcome for this noob.

Bilpier
January 20, 2007 1:42:46 PM

Quote:
I currently have a 3800X2 and considering buying an opty 170 as a final upgrade to MSI RD480 Neo2 F1 Socket 939 Mobo.

I can OC the 3800 to 2.2 with reasonable stability, but no further.
Is the Opty worth it, and how high can it be OC'd??

Any help or comments are welcome for this noob.

Bilpier


I can't accept that you can only get that processor to 2.2Ghz. What kind of RAM do you have? Are you changing the voltages?

The Opty has more cache (1MB) and -will- overclock very well, most people can hit 2.6 or so on stock air, but it sounds like you're having issues with overclocking.
January 20, 2007 2:03:42 PM

I wouldn't even consider that an upgrade. The only CPU upgrade that would leave you noticing a serious difference would be the X6800 or QX6700.
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January 20, 2007 2:08:22 PM

with an x2 3800+, you should be able to get to 2.4 on stock 1.35-1.4v... 2.5GHz with a .25v increase... 2.6GHz with a .5v increase... 2.7 .75-1.00v increase... etc... either way, stay at or below 1.5v on the cpu (not advisable to higher)

but, i agree, it definetly sounds like OC configuration issues (or memory problems, possibly the motherboard, not sure)... youll need to reduce the memory speed from 200 to 166, 133, or 100 (depending on the OC increase), adjust memory timings too, in order to OC the cpu by much in most cases, definetly incase your memory doesnt OC well (because it OCs by the same amount your cpu does)... also reducing the htt multiplier to 3x is necessary above 2.4, (reducing to 4x at up to 2.4GHz from 2.0GHz)

you also might need to increase the memory voltage some when you get high enough
January 20, 2007 2:21:54 PM

Memry is 2x1 Gig OCZ platinum ddr400 timing2,3,2,5.
January 20, 2007 2:23:31 PM

Quote:
Memry is 2x1 Gig OCZ platinum ddr400 timing2,3,2,5.


So you have good memory and that's the best OC you can get?

Please walk us through the changes you've made (from the default settings) so we can better understand. You should be getting such a better OC.
January 20, 2007 2:25:08 PM

yeah... in that case, i would first relax the timings, to 3-3-3-6 see if that helps at all (or more, if needed)... second, reduce the memory speed from 200MHz, down to 166MHz... see how much that helps

if you can get a noticable OC, try tighting the memory timings some again, until its unstable again, then back them off some
January 20, 2007 2:39:12 PM

This mobo has so many adjustements, i d'ont know where to begin, ie:

ddr memory frequency
memory voltage
dram timing
cas latency
tras
trp
trcd
trrd
trc
trfc
trwt
dram cmd-addr timing
north bridge voltage etc....
which ones can or should be changed? I fooled around before and had to reset the cmos jumper as it would no longer boot.
Hope you guys can help me with safe settings...

TIA
Bilpier
January 20, 2007 3:05:00 PM

ddr memory frequency is the clock speed of the chip, so you want to take that down from ddr400 (200mhz) down to ddr333 (166mhz) (when OCing up to 2.4, HTT multiplier 4x), ddr266 (133mhz) when OCing much more than 2.4, up to about 2.6-2.7 (HTT multiplier 3x)... going down to ddr200 (100mhz) would really only be necessary if youre OCing to 2.8 or above (i would think anyhow)

you should be able to get to at least ~2.6 (2.5 to 2.7, either way)

(first number) CAS latency should be changed from 2, to 2.5, or even 3

(second number) tRCD should be set to 3, 4, 5 etc (higher is slower)

(third number) tRP should be set to 3, 4, 5 etc (higher is slower)

(fourth number) tRAS, not important to change really, its 5, more couldnt hurt, not too necessary to change, maybe 6, 7, or 8 if you wanted to

dram cmd-addr timing should be adjusted to 2T, 1T is faster, but again, 2T might be necessary to get a higher OC (if you can do 1T while also having an OC, all the better)

memory voltage is the only other one thats significant when you get high enough in clock speed, it wont need to be adjusted right away, and not for at least a few hundred mhz cpu increase either way

the other settings dont matter too much, TBH... and, im not sure about a lot of them myself (someone else can probably clear that up better)... the north bridge voltage is the only one im wondering about, but i wouldnt increase it unless you really needed to (should find out)

but when you reach a high enough clock speed, you can try tightening settings again, to see whats the most stable, while offering the best performance

beyond that, youll want to check for stability with a program like orthos, to see if the OC you have is stable, leave it running for at least 10 minutes, longer is better, try to stay at or below ~60C cpu temperature (too much higher and you will have instabilities)
January 20, 2007 10:39:50 PM

Thank you very much for the detailed info.

I'll give it a try.

Bilpier
January 21, 2007 11:44:02 AM

welcome... one last thing though, be sure to back up your data... OCing can cause data corruption on a hdd (experienced that before myself with a bad OC)
January 21, 2007 12:43:47 PM

the best way to get a really good o.c with a 939 is to get a dfi board. i went from 2.4 max o.c on the same msi board as yours to 2.9 on a dfi lan party sli-dr. they are very cheap to buy now. but at that point you should just buy a 6300-6400 and cheap 965 board and it would kill that opty.
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