* UPDATED* Sempron 64 2800+ Palermo, 800mhz oc, 100% stable.

[batmang]

edit (4/1/06 - 100% STABLE - prime95 and gaming tested:
validated: http://valid.x86-secret.com/show_oc?id=83486
Sandra:
http://pics.bbzzdd.com/users/batmang/s642800-cpu-comparison.jpg
http://pics.bbzzdd.com/users/batmang/s642800-cpu-media-comparison.jpg

i picked up a sempron 64 2800+ to use with my older chaintech vnf3-250 motherboard.
paired with some cheap 512x2 2700 ddr memory, i got it up to 2.0ghz(1.6ghz def.), 253fsb.
memory is running at 416mhz with relaxed timing. (333 def.)

this is with the stock hsf, stock vcore. with the latest bios for the vnf3-250, the vcore cannot be changed. im stuck at the default. i have to use this bios because this is the latest/only one that supports the sempron 64's.

so.. is this a decent overclock? 400mhz.

http://pics.bbzzdd.com/users/batmang/2800at2ghz.jpg
http://pics.bbzzdd.com/users/batmang/2800at2ghz-mem.jpg

 

[Zap]

Zap's AMD Socket 754 vcore guide

Most people are getting higher overclocks with the Palermo chips. If it's a D0, 2.2+GHz may be possible without vcore and an E3 or E6 would do better.

Have you tried higher speeds? My Chaintech VNF3 and Palermo combo would hit just over 270MHz HTT, though the same D0 CPU would do 300+ HTT on other boards with vcore.

 

[PingSpike]

I'm getting 2.340ghz out of mine with the latest bios, stock vcore.

You can use the older bios though, they just won't report the name of the cpu properly, but it will run fine.

 

[batmang]

Originally posted by: PingSpike
I'm getting 2.340ghz out of mine with the latest bios, stock vcore.

You can use the older bios though, they just won't report the name of the cpu properly, but it will run fine.

what motherboard? what ram, what timings? etc.

any help would be appreciated.

 

[BlueWeasel]

What PC2700 RAM is that and what voltage are you running at? 208Mhz (effective 416Mhz) is a pretty impressive overclock for PC2700. I had some Muskin ValueRAM PC2700 that would do 215Mhz at CAS 2.5....damn, that was some good memory.

 

[PingSpike]

Originally posted by: batmang

Originally posted by: PingSpike
I'm getting 2.340ghz out of mine with the latest bios, stock vcore.

You can use the older bios though, they just won't report the name of the cpu properly, but it will run fine.

what motherboard? what ram, what timings? etc.

any help would be appreciated.

Sorry. Chaintech vnf3-250. Corsair VS, 193mhz with the timings tightened down to 2-3-2-10 1t I believe. 3x LDT, 290 cpu clock. I think it was stable up to like 295 but I backed it down some.

 

[batmang]

Originally posted by: BlueWeasel
What PC2700 RAM is that and what voltage are you running at? 208Mhz (effective 416Mhz) is a pretty impressive overclock for PC2700. I had some Muskin ValueRAM PC2700 that would do 215Mhz at CAS 2.5....damn, that was some good memory.

I dont even know the brand. Friend of mine gave them to me, theres no stickers on them.

I let the cpu " burn in " all night last nite. Ran prime95 for about 8-9 hours total. Passed all night. This was at the settings listed in my first post. I plan to play with things more once I get home from work. I'm anxious to see what this Sempron is capable of.

Also, I did have some Artic Silver Ceramique Compound but I cannot find it! I'm using the stock paste, which isn't the greatest. But, I had no other alternative. I did end up finding an old tube of Artic Silver II, but I had already put everything together. And now I'm too lazy to clean up the spread.

 

[rogue1979]

Why don't you lower the memory speed with the divider to PC2700 speeds and loosen up the timings for now, take the memory completely out of the equation? Find the fastest fsb and processor speed, then try to raise the memory divider and tighten up the timings.

 

[batmang]

i plan to today, i just got the system up and running last night, had about an hour of playtime. will try and see how much farther i can take it today.

 

[DrMrLordX]

I have an older Sempron 2800+(the kind without x86-64 support) running at 2.32 ghz on a vnf3-250 at stock vcore with the stock hsf.

 

[batmang]

welp, i beleive i found the magic settings.

http://pics.bbzzdd.com/users/batmang/2800sempronAT2571ghz.jpg

validated:
http://valid.x86-secret.com/show_oc?id=83033

stock vcore too.

ran prime95 for about 15 minutes, then stopped because i need to finish up my software installs. but... i did install windows at 2.5+ghz.. im still going to run prime95 though.

 

[DrMrLordX]

That's a pretty good HTT speed for a vnf3-250! Mine wasn't happy past 310mhz HTT.

 

[BlueWeasel]

That's an impressive OC on stock voltage, even for a E6 Sempron.

 

[Zap]

Heh, the Chaintech VNF3 that I used to have wasn't happy above around 270MHz HTT.

 

[PingSpike]

I started to encounter issues at around 300...I can't remember where exactly.

Upping the chipset voltage seemed to do nothing for it.

 

[batmang]

welp, i backed it down to 312fsb, 2.496ghz. was crashing games. ran prime95 all night last nite, 9 hours total, no errors, passed all nite. woot.

 

[PingSpike]

Nice! What vcore did you end up running?

 

[BlueWeasel]

Originally posted by: PingSpike
Nice! What vcore did you end up running?

Since he backed the speed down, I assume he's still running at the stock voltage.

My E6 Sempron 3100+ is currently running at 2.47Ghz (8x309) on a Epox 8KDA-3I I picked up used from Zap. I've confirmed that the board will go as high as 320-320 FSB.

Strangely, though, I'm trying to figure out if the BIOS reported voltage is correct. Right now, the voltage in the BIOS is set at +/- 0.00v (stock), but is being reported as being at 1.53v. It seems odd that the board would overvolt THAT much. Even if it is running at 1.55v, my temperatures are in line with other overclocked Semprons running at 1.40 (idle temps in the low 30s, max load temp of 45C).

I'm probably going to use a digital MM to check the true voltage being given to the chip, but haven't got around to it. I really think I've got a flakey Winbond monitoring chip or something.

 

[batmang]

Originally posted by: PingSpike
Nice! What vcore did you end up running?

stock vcore. i got the motherboard up to 333fsb, but it wouldnt post. i did post at 330 though. it just wouldnt boot into windows. but the most stable for me right now, is 312. which is still a
896mhz overclock. wooooo

 

[PingSpike]

The trouble with the vnf3-250 for me was that its temp sensor seems completely useless. Reports the same idle and load temps regardless of the overclock, they seem high at stock speeds but acceptable for when overclocked. I just tend to ignore them and assume things are ok since the sink doesn't even really get warm.

 

[batmang]

Originally posted by: PingSpike
The trouble with the vnf3-250 for me was that its temp sensor seems completely useless. Reports the same idle and load temps regardless of the overclock, they seem high at stock speeds but acceptable for when overclocked. I just tend to ignore them and assume things are ok since the sink doesn't even really get warm.

yep, i totally agree. i could lay my face on the heatsink, its no where near as hot as any other cpu's ive overclocked.

when i had my p4-2.4c @ 3.2ghz, u wouldnt dare touch it. lol

 

[batmang]

hrmm. this is strange.
9-10 hours of prime95, no problems. passes. but i play a game for 15-20 minutes, the game will crash out and exit me to windows. no freezing, just the game freezing.
both cs and css did this to me. possibly a memory issue?

 

[batmang]

hrmm, let memtest run for about 45 minutes, no errors. weird.

 

[furballi]

Back off the FSB by 10MHz and retest.

 

[rogue1979]

Originally posted by: furballi
Back off the FSB by 10MHz and retest.

Yes, or try lowering your HTT.