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x2 3800 Owners - OC's

HungryHippos

HungryHippos

HungryHippos

Soldato
Joined
25 Mar 2004
Posts
15,941
Location
Fareham
I'm interested to see how far some of you have gotten with overclocking your x2 3800 chips. I've got mine at 2.5ghz and it seems stable, passes a few hours of prime, SnM, super pi 32M np's. Want to make an Excel sheet of all the clocks people have gotten and what settings :)

Please include all of the details which will fill up the table contents, i'll rank them according to how fast the clocks are!

x2.jpg


Maybe there is some kind of CPU test we can run to compare performance? Super pi? Sisoft Sandra CPU arithmetic bench?

Also interested in temps at idle and load if you can.
 
thanks guys updated spreadsheet, as you can see still some missing info from you two so if you can fill in the blanks would be great :)

Spluff, if you run CPUz it should say revision E4 or E6, E4 = Manchester core like mine, and E6 = Toledo, CPUz always reports the x2 3800's as Toledo cores so you need to look at the revision instead.

My temps are actually really good, it's currently idling at only 31 degrees, but it can idle at anywhere between 30 and 35. Under load with two primes running and the side of my case off temps never got above 41 degrees the other day, with case side on prolly a few degrees up at maybe 45.

Bear in mind the Manchester cores seem to run cooler for some reason, but apparently they don't really clock better as people have had good results from all of them.

I could run just fine at 2.5ghz 1.4Vcore, but trying to boot into Windows at 2.6ghz and with 1.425 VCore was a no-go, just froze on windows loading screen. Have managed to get into windows now at 2.6ghz with 1.5Vcore, will try this at 2.7 :)
 
Spluff, the memory you have should be capable of running 250FSB at the current timings you are using. When I put 3-3-3-8 on the chart what i'm referring to is :

CAS latency - RAS to CAS - RAS Precharge - RAS cycle time (could be Min RAS active Time on yours?)

I suggest leaving mem timings as they are for now, just make sure it's in dual and running in 1T mode (Think Everest Home Edition can tell you this, but i'm pretty sure it's the Write CAS latency 1 you have there demonstrating 1T).

Updated chart, still a couple of things missing but they're minor, so fill in whenever you want to. Spluff I might suggest you get a new cooler tbh if you want to overclock further, my temps improved a lot after I replaced the stock cooler with an Arctic Freezer 64 PRO and used Arctic Silver 5 instead of the stock Thermal Interface stuff.

Apparently freezer 64 PRO doesn't cool too well above 2.5ghz though, so if you intend to go much higher i'd suggest something like the thermalright XP90/120.

You're doing the right thing, slowly pushing the speed up and checking stability.

Spreadsheet up to date as of now :)
 
Way I see it you could either get a new cooler and have a better chance of hitting 2.5ghz which is probably optimum for you (1:1 on the RAM), or you could probably look at tightening the timings on your memory since it's probably underclocked at the moment and just clock it to like 2.3ghz for 24/7 usage if it's stable.

New coolers don't have to be very expensive, the Arctic Freezer 64 PRO can be found for £17 inc VAT on the web, and should cool it quite nicely up to about 2.5 ghz ;) is a ***** to install though!
 
Added you Pumpman, keep em coming in folks want a good 10-20 in the spreadsheet at least! :)

I can boot in at 2.7ghz but it BSOD's almost straight away even with 1.525 Vcore, otherwise the best I got was 2.65, but to hit that speed I had to underclock my RAM by a good 30mhz, which meant my comp performed about the same as when it was at 2.5. Therefore I didn't see the point of overclocking higher than 2.5, especially as this seems stable and is still a nice cut above stock performance wise :D

Pump, your temps do seem to be getting a little toasty at load, but if it's stable I guess no probs? besides winter is fast coming on the extra heat will prolly be welcome xD
 
ok spluff will update yours next time just missed it hehe :)

Well Sculptor has taken the lead, as just gonna say wanted to see what some people were hitting on water cooling, temps look nice! Ran sisoft sandra 2005 arithmetic on mine and scored :

22489 MIPS
10220 MFLOPS

so not too shabby, was ahead of all the other x2 cores in comparisons.
 
Paradroid said:
Gonna go for 2.7ghz tonight and see if i can get it stable @ 1.5 v :)

8 hrs prime should be enough

Temps are 39c idle 54c load :)
Click to expand...

Good luck with that, not managed to stay in windows at 2.7 for more than a few secs tbh, even with >1.5V. I think my mobo is holding me back though, won't post with 290+ HTT so I can't lower my multi and get my RAM to run at a decent clock above 2.5ghz anyways :S

managed to get stable at 2650 but i'm not including it because it's not what i'd run at full time anyways ;)
 
hehe put you down as 2nd coz you said your Vcore was 1.5 + Auto when i need to know whether it's above or below Sculptors 1.54 ;) also your RAM is at such a low clock that his is undoubtedly better performance atm.

My mobo is not so good for overclocking, fine for a nice mild overclock but lacks options, 3V max on RAM, 1.55 max Vcore, craps out and won't POST when HTT is above like 280 even with a lower multi, otherwise just fine :)
 
have you tried loosing them back to stock (3-3-3-8?) and running them 1:1?

Some people have managed to get their ballistix doing 1:1 at even 300HTT so if your stuff is good you might be able to do 1:1 at 270 :)
 
table updated, need more info from you max powah though you're making it look ugly with ?'s :)

Yeah if you wanna run your chip higher you should try running your RAM on a divider or you'll find it will stop you clocking too high.
 
yeah your core is a toledo, I highly recommend you drop your ht frequency down to 3x or 4x as at 5x 210 it's at 1050 when it needs to be kept below 1000 really. alos i'd drop you ram to a divider to take it out of the equation for now.
 
ht frequency doesn't really effect performance at all, it's just you need to keep it's total value below or on 1000. ht frequency multiplied by HTT gives you a total. For example ht of 5x and a HTT of 250 will give you 5 * 250 = 1250. but by reducing ht frequency to 4x you'll hit exactly 1000 which is stable :)

So in short you can use ht frequency at 4x at anything up to 2.5ghz on these chips, as long as you're upping the HTT and leaving the multi at 10. IF you drop the multi and raise the HTT above 250 then you'll need to lower the ht frequency to 3x.

Example of the above with an ht frequency of 4x

250 * 10 = 2500mhz cpu speed, but also gives us 4 x 250 = 1000
300 * 9 = 2700mhz cpu speed, but would give us 4 x 300 = 1200

so to correct the 2nd equation you'd need to set ht frequency to 3x giving :

300 * 9 = 2700mhz cpu speed, and 3 x 300 = 900 :)

To spluff, 9.5 * 1500 is mathematically impossible for your clock speed, need clarfication, and an important note to all AMD overclockers :

NEVER use a multi which isn't a whole number, multi of 9.5 will reduce performance, multi of 9 or 10 is way more preferable even at slower clocks.
 
sorry guys been unable to access the OCUK forums inexplicably for a month or so until now, think it might have had something to do with the fact i'm on NTL and something was changed.

people are free to take over updating the table but i'm no longer able to find the time to, especially with how far behind I am on it now.
 
I was dual prime testing my x2 3800+ at 2.5ghz with 1.425Vcore the other day, tests passed pine for 10 hours of small FFTs, but when I tried to use World of Warcraft afterwards it kept crashing on me (program not responding) so I kept having to close it, comp was still running though.

Ran large FFT's overnight for 7 hours or so and it passed ok, but again when I went to play WoW it would crash (was fine after a reboot though) and when I tried HL2 that crashed with the message memory could not be read, and straight after I got a BSOD.

I wanna make sure my system is as stable as possible but obviously if games are crashing after some use something could be up along the way here. which tests should I run to ascertain whether or not my computer is stable?

p.s my cpu was reaching about 55 degrees after 10 hours of prime, and my mobo temps were reading into the 40's earlier would could have been one of the reasons for the crashes?

cheers.
 
Hi all,

just recently changed my mobo from the asus a8n-e ultra to an asus a8n-sli prem and all my stability problems seem to have gone (fingers crossed), this board seems much better no bsods so far or freezes :)
 
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