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sempron 64 overclock

post #1 of 22
Thread Starter 
I have a sempron 64 2800+ which works on 1.6 GHz. I have clocked it on 1.8 and everything worked fine for days. Than i clocked it on 2.0 and strange blue screen appeared, and i had to restart my PC, and after that it wouldn't boot to windows. Wouldm't even go into BIOS, so i had to clear MOS with jumper on MB. I wonder if that happened because i didn't raise voltage at all on my CPU which works on 1.5V. Maybe i should raise it to 1.6V, and try again?
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post #2 of 22
Quote:
Originally Posted by blacklord
I have a sempron 64 2800+ which works on 1.6 GHz. I have clocked it on 1.8 and everything worked fine for days. Than i clocked it on 2.0 and strange blue screen appeared, and i had to restart my PC, and after that it wouldn't boot to windows. Wouldm't even go into BIOS, so i had to clear MOS with jumper on MB. I wonder if that happened because i didn't raise voltage at all on my CPU which works on 1.5V. Maybe i should raise it to 1.6V, and try again?
Fill in your profile, what mobo and ram are u using would help for a good start ?
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post #3 of 22
I would recommend reading other threads and messages related to the Sempron 2800, I know for fact one user is running his at 2.4 stable.

you probably maxed your RAM in which case you'll have to use a divider.....I'/m sure if you read a bit here before you overclock your machine.

I'm sure others with the same processor have posted their settings and you can probably safely copy those.
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Sempron 3100+ (289x9) Asus K8N (nforce-3 250) Asus N6200 1024MB Legend @236MHz 
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Sempron 3100+ (289x9) Asus K8N (nforce-3 250) Asus N6200 1024MB Legend @236MHz 
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post #4 of 22
Probably the voltage. Raise it a bit and see what happens. Do a searth for Sempron 2800 and I bet youll have some luck
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The Move
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post #5 of 22
Set a divider. I have mine at 2400mhz on the stock voltage with a divider.
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post #6 of 22
Thread Starter 
Quote:
Originally Posted by Jori
Set a divider. I have mine at 2400mhz on the stock voltage with a divider.

I have abit k8t800 pro, socket 754 MB, 1*1GB PQI RAM, and rest is probably not important.

How do dividers work? I have seen it in BIOS, but i'm not not sure how they work, and how to set them up for my CPU. RAM latency is 3-4-4-8.

How do I write my PC specs, like you all did etc. MB model, CPU......you all have it under your profile.
My System
(13 items)
 
  
CPUMotherboardOSPower
Sempron 64 2800+, sck.754 Abit K8T800 pro, 3rd eye Win XP Chieftec 410W 
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My System
(13 items)
 
  
CPUMotherboardOSPower
Sempron 64 2800+, sck.754 Abit K8T800 pro, 3rd eye Win XP Chieftec 410W 
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post #7 of 22
when you increase your fsb speed your ram speed increases as well.

if you have your ram set to its stock speed ie. DDR400 = 200MHz, then when you increase your fsb your ram may only allow it to be increased a little before the ram speed limits any further increase.

in bios you can set your ram to run slower than stock speed ie 166, 133 etc. which will give you headroom to increase your fsb more.

eg. at stock ram speed I can only increase my fsb to 238MHz before unstable.....but seeing as though I set my DDR400 RAM as 133MHz then I am able to run my fsb at 300MHz.

Seeing as though increase in fsb = increase in ram speed, starting the ram speed lower means you can increase the fsb without having your ram limit your system too quickly.

seeing as though I set my RAM at 133....when I increased my fsb to 300, my ram increased to 196 which is just under stock speed anyway.

this table will give you an idea of what speed your RAM will run when your fsb is at certain speeds with RAM dividers.

http://math.gogar.com/athlon64.cgi?htt=300&showtable=1

Edit: to display your system specs go to "user cp" at the top of the page and select "edit system specs" and enter your stuff.
My System
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CPUMotherboardGraphicsRAM
Sempron 3100+ (289x9) Asus K8N (nforce-3 250) Asus N6200 1024MB Legend @236MHz 
Hard DriveOSMonitorPower
Seagate 80G SATA Windows Vista RC1 21" Panasync S110i Vortex-500 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Sempron 3100+ (289x9) Asus K8N (nforce-3 250) Asus N6200 1024MB Legend @236MHz 
Hard DriveOSMonitorPower
Seagate 80G SATA Windows Vista RC1 21" Panasync S110i Vortex-500 
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one with lights Logitech MX510 
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post #8 of 22
Thread Starter 
Thank you so much on this explanation. So i don't even have to touch my dividers (i can leave them at 1:1), and all i have to do is lower RAM freq. to 133? Can you axplain this table a little bit better-divider "1:1" means "fsb freq:RAM freq" rigth? What are the numbers in brackets on top of the table (under dividers) and what are numbers in the table itself?
My System
(13 items)
 
  
CPUMotherboardOSPower
Sempron 64 2800+, sck.754 Abit K8T800 pro, 3rd eye Win XP Chieftec 410W 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardOSPower
Sempron 64 2800+, sck.754 Abit K8T800 pro, 3rd eye Win XP Chieftec 410W 
  hide details  
Reply
post #9 of 22
ok.......yes 1:1 is fsb = RAM speed.

The table at the top shows ratios and in brackets the ram speed at those ratios (based on DDR400)

so 1:1 = 200:200
5:6 = 200:166
2:3 = 200:133 etc.

if you input at the top a fsb speed, the table shows you what freq your RAM will be at that speed using the ratios at the top and the fsb multipliers at the side.

edit: lowering your ram speed sets the dividers
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Sempron 3100+ (289x9) Asus K8N (nforce-3 250) Asus N6200 1024MB Legend @236MHz 
Hard DriveOSMonitorPower
Seagate 80G SATA Windows Vista RC1 21" Panasync S110i Vortex-500 
CaseMouse
one with lights Logitech MX510 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Sempron 3100+ (289x9) Asus K8N (nforce-3 250) Asus N6200 1024MB Legend @236MHz 
Hard DriveOSMonitorPower
Seagate 80G SATA Windows Vista RC1 21" Panasync S110i Vortex-500 
CaseMouse
one with lights Logitech MX510 
  hide details  
Reply
post #10 of 22
The KT800 does not utilize a "lock" for the PCI/AGP, only the 800 Pro and 880 do so that could very well be your problem. As you increase the HTT the PCI bus increases and once it excedes 37MHz instability follows.
    
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