Got my new Sempron 2800+ today

[Tostada]

I just got my Sempron 2800+ from ZZF (1.6 GHz Palermo SDA2800AI03BX). It shows up on POST and in Windows as "AMD Hammer Family processor - Model Unknown" on my DFI LanParty UT 250Gb.

It doesn't seem to OC quite as well as the original 90nm one (Oakville SDA2800AI03BA, which people called a Palermo for some reason), but it does have AMD64 enabled.

The most I can get out of it is 240 FSB * 8 = 1960 MHz. That's with the stock heatsink at stock voltage, and it doesn't go above 39C. It's completely stable after tons of benchmarks, but as soon as I bump it up to 245 FSB it immediately fails after POST, even at 1.55V.

Fired up Sandra and it confirms that SSE3 Technology and AMD64/EM64T Technology are available. I'll try installing a 64-bit OS in a few days.

Here are some benchmarks:

Sempron 2800+ (original 90nm)
1.60 GHz Oakville SDA2800AI03BA
DFI LanParty UT 250Gb, Windows XP Pro, 1GB PC3200
all speeds at default

SuperPI Mod 1.4, 1 mil = 54.789s
SuperPI Mod 1.4, 8 mil = 9:50.0
Sandra CPU Dhry MIPS = 7,441
Sandra CPU Whet MFLOPS = 2,540
Sandra CPU SSE2 MFLOPS = 3,288
Sandra CPU MM integer = 15,342
Sandra CPU MM float = 16,504

Sempron 2800+ (64-bit)
1.60 GHz Palermo SDA2800AI03BX
DFI LanParty UT 250Gb, Windows XP Pro, 1GB PC3200
all speeds at default

SuperPI Mod 1.4, 1 mil = 54.879s
SuperPI Mod 1.4, 8 mil = 9:46.0
Sandra CPU Dhry MIPS = 7,437
Sandra CPU Whet MFLOPS = 2,539
Sandra CPU SSE2 MFLOPS = 3,287
Sandra CPU MM integer = 15,335
Sandra CPU MM float = 16,495

Sempron 2800+ (64-bit)
1.96 GHz (240 FSB)

SuperPI Mod 1.4, 1 mil = 47.979s
SuperPI Mod 1.4, 8 mil = 8:31.2
Sandra CPU Dhry MIPS = 8,889
Sandra CPU Whet MFLOPS = 3,035
Sandra CPU SSE2 MFLOPS = 3,929
Sandra CPU MM integer = 18,329
Sandra CPU MM float = 19,715

 

[Hacp]

Maybe lower LTD to 3 (although Im sure you know that)...... These chips SHOULD be able to Oc just as well as the Venices..... Maybe AGP/PCI Lock???? Reason i'm asking is because 240 seems to be the point where these problems arise.... I'm sure you tried all this but double check!

 

[DrMrLordX]

I believe all the 90nm Semprons carry the core name Palermo. Not sure where you're getting the Oakville name.

Nice that they're got 64-bit Semprons out there, though. Too bad about the modest OC. And yeah, sounds like it might be an AGP/PCI issue.

 

[Furen]

Oakville is an internal AMD codename, I believe. All the 90nm semprons ended up being "Palermo" officially, even though some are D and some are E stepping.

 

[Sunbird]

I got a Gigabyte K8NS motherboard with nForce3 250+ chipset and Sempron 2600+ (1,6GHz stock, 128kb L2 cache, Socket 754, 1.4V stock). My memory is 2x Transcend DDR400 512MB sticks

I can stably get it up to a base clock of 240MHz, resulting in 1,92GHz (20% speed increase) at 1,5V and 28°C temp idle and 34°C at load. I set memory speed to start off at 166MHz and with overclocked base clock its running at 192 @ 2-3-3-7 @ 1T .

Any higher and it doesn't go. My PCI/AGP lock is on 66MHz. So I have the same limit as the OP.

 

[Hyperlite]

if your only at 34c load, i'd say pump up the vcore a bit and keep trying...

 

[Tostada]

Originally posted by: Hacp
Maybe lower LTD to 3 (although Im sure you know that)...... These chips SHOULD be able to Oc just as well as the Venices..... Maybe AGP/PCI Lock???? Reason i'm asking is because 240 seems to be the point where these problems arise.... I'm sure you tried all this but double check!

Actually, I already have the LDT lowered to 3.0.

 

[ItsAlive]

I just recently got my system setup with my 3100+ SempyRon on this K8NS Pro board and i know of atleast one other person who attained speeds of near 2.7GHZ with the 2800+ chip on stock cooling. Id say try raising your DDR voltage to 2.8 that solved alot of my problems. 😉

 

[Avalon]

There's no way that the Palermo stops dead at the 2ghz mark. I'd double check all your BIOS settings and see if anything is askew. You've got a great motherboard, so it should be able to handle the overclock just fine.

Are you making sure to use memory dividers to take your memory out of the equation?
Have you disabled CPU Spread Spectrum?
Is CnQ disabled?
What BIOS do you have?

And, although I'm sure this is probably fine, but what Powersupply do you have, and do you notice any large fluctuations in your 12v line before/after overclocking?

 

[ItsAlive]

I didnt notice that your board wasnt recognizing your CPU correctly. You should get the latest bios updates for that board. That might help solve some of the problem.

 

[DAPUNISHER]

I have a DFI 250GB, go with the latest bios, and if you have a SATA on 1or2 put it on 3or4. Multiple sticks of DS ram may require 2T and slots 1&3 for stable operation. Check the NB heatsink, mine was getting uberhot, so I replaced it with a Zalman.

 

[WhoBeDaPlaya]

Running a 3400+ Sempy with (supposedly) value Crucial RAM. Runs fine @ DDR466, 1T, CL3 at stock voltage. See rig for details 😀

I'm extremely satisfied with this CPU, will probably buy another.