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help ocing a 2.8C

C

Corporate Thug

Lifer
so i gave my nicely overclocking 2.8C to my bro and got a new one

its a D1 stepping SL6WT malay

it does 3.2 ghz on 1.55 actual volts with 1:1 ratio (Geil pc400)

i can go up to the 230-233 FSB range but anything more than that gives me errors in primes regardless of the voltage i use

i'm using an IS7 and a antec 380W truepower if that matters

i hear the D1 steppings are supposed to be pretty good OCers, am i missing something here?
 
Most 2.8C's are D1's, and most will do around 240FSB on stock voltage at least. You need to first make sure its not your memory thats causing problems, change the cpu divider to 5:4.....and see if you can't overclock more. I see you are using PC4000 so that shouldn't be the problem, just make sure its not. Next thing I would be concerned about is your PSU, I had an Antec 450W and it did not want to OC my 2.8C as much as my Enermax 460W would. If not any of that, you just got a stingy chip that doesn't like the high speed. Tough break. Shop around for an M0.....they will do at least 3.5 with minor voltage increases.....my M0 does 3.6ghz @ 1.65v (I had a 2.8 D1 previously it would do 3.5ghz @ 1.65v).
 
just out of curiosity, why would 5:4 be any more helpful than 1:1 when the ram is rated to 250 mhz??

edit: just tried 5:4 w/ 1.65v, falied immediately, i'm gonna try memtest...
 
It's not your ram so I wouldn't mess with the divider. The 2.8 M0 is usually the better ocer but I don't seem them hit over 3.5 often. BTW what timings and vdimm are using on the RAM? Also what temps and cooling are you using on the chip?
 
THat seems to be a bit warm under load. You really should look into getting a SP-94 HS, they are awesome. Are those timings your memory's rated speed? Just to be sure run Memtest to rule out memory? I don't what else you have in your rig but you may also want to think about upgrading that PSU. Also are you locking the AGP/PCI to 66/33?
 
I had a 2.8C SL6WT and same HSF, could only get it stable around ur speeds 233-235 FSB using OCZ PC4400 (rated at 275mhz FSB)
anyways, try loosening ur timings to 3-4-4-8 and upping voltage to 1.57/8 then 1.6, 1.62, 1.65v, agp to 1.65 or higher, vdimm 2.8v or whatever your max rated voltage is for ur ram.
 
Originally posted by: AristoV300
THat seems to be a bit warm under load. You really should look into getting a SP-94 HS, they are awesome. Are those timings your memory's rated speed? Just to be sure run Memtest to rule out memory? I don't what else you have in your rig but you may also want to think about upgrading that PSU. Also are you locking the AGP/PCI to 66/33?
Click to expand...

hmm, 55c is a bit high but i really dont see that as being the problem. i wouldnt worry about heat just yet.

the memory is rated to 2.5-4-4-7, and the AGP/pci is locked @ 66/33

i dont think its the PSU either

the 3.3 rail is putting out 3.28V
the 5 rail is putiing out 4.95V
and the 12V is putting out 11.85V

edit: i dont have a floppy drive, is there any other way to run memtest? i know there is a bootable iso, but what program can i use to put it on a cdrom?
 
Memtest

They have a ISO file so you can run it from CD here.

edit: Sorry didn't read it correctly. Any burning software like NERO should be able to make a CD from an ISO file. If all else fails and the memory is running fine and even at 1.65 you can't get anymore than your chip just might not be a good ocer. I have had some before. Try to get a 2.8 M0 stepping.
 
i used nero and simply clicked and dragged the two files onto a cd, i went into the BIOS and set the primary boot device to CDROM but the computer simply boots into windows as normal 😕
 
You don't add the iso file to the cd. It is an image not a program. You should have the option to create a cd of a previous made image (.iso).
 
Your a Lifer you should know everthing😉 If you use Nero Express use the Disc Image or Saved Project option. Are you using Nero 6?
 
thanx for all your help AristoV, i just havent used nero in a very long time. i played around with it for a few minutes and figured it out

/off to run memtest
 
You should try running your RAM @ 3-4-4-8.....that is what most PC4000+ RAM runs at....you will see no performance boost from 2.5-4-4-7 anyways....so you might as well relax those timings and rule out that your RAM isn't the problem.

Alcohol 120%? What is that, is that stronger than 100% alcohol, and can you possibly get something that has more than 100%? Very confusing.
 
LOL so just b/c Geil says that there RAM will run at those timings means that it will? Since when? Geil is the worst about this too. He needs to make sure that its not that Geil RAM thats causing his instability.
 
Originally posted by: shady06
Originally posted by: AristoV300
THat seems to be a bit warm under load. You really should look into getting a SP-94 HS, they are awesome. Are those timings your memory's rated speed? Just to be sure run Memtest to rule out memory? I don't what else you have in your rig but you may also want to think about upgrading that PSU. Also are you locking the AGP/PCI to 66/33?
Click to expand...

hmm, 55c is a bit high but i really dont see that as being the problem. i wouldnt worry about heat just yet.

the memory is rated to 2.5-4-4-7, and the AGP/pci is locked @ 66/33

i dont think its the PSU either

the 3.3 rail is putting out 3.28V
the 5 rail is putiing out 4.95V
and the 12V is putting out 11.85V

edit: i dont have a floppy drive, is there any other way to run memtest? i know there is a bootable iso, but what program can i use to put it on a cdrom?
Click to expand...

Your 2.8C and those geil are just fine. It's definitely your PSU, those voltages should be at mobo sets or higher.
 
I have same cpu and ram, but I don't know what mobo you're using.

On air cooling, I'm running stable with 1000mhz bus at 1:1 ratio (2.8c to 3500). My sweet spot on voltages:
vcore 1.52v modded to 1.62v
vdimm 2.60v modded to 2.65v
 
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