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Underclocking

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a c 114 À AMD
April 2, 2010 11:10:43 PM

I have a craptop, here's the specs:

eMachines E620-5885/Acer Aspire 5515

AMD Athlon 64 2650e 1.6GHz
2GB PC5300 DDR2-667
ATi Radeon X1200 (256MB allocated)
WD 5400rpm SATA HD
Northbridge: AMD RS690MC
Southbridge: ATi SB600 (Jesus, it's the same southbridge as my desktop gaming rig! LOL)
PLL Chip #: ICS951462

I use this thing for school and so I don't even need it running at 1.6GHz. I underclocked it to 1.4GHz to reduce heat and increase battery charge life but it's not stable at this frequency, I had to put it back to 1.6GHz. Can anyone tell me why this is? I'm accustomed to overclocking causing instability because of hardware strain but I didn't know that underclocking could do it as well. If you need more info on my laptop here's a page for it:

http://www.tigerdirect.ca/applications/searchtools/item...

If what you want to know isn't listed, just ask. I can find out anything about this laptop. Thanks in advance. :sol: 

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a b K Overclocking
April 3, 2010 1:23:17 AM

maybe the voltage was to low to run the cpu at that speed...
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a b K Overclocking
April 3, 2010 1:33:59 AM

How are you exactly underclocking that lappy? The bios should be locked so if you are using third-party software to underclock the CPU you will need to adjust a few other values as well.
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a b K Overclocking
April 3, 2010 1:45:33 AM

That's what I was wondering...
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a c 114 À AMD
April 3, 2010 1:45:35 AM

OvrClkr said:
How are you exactly underclocking that lappy? The bios should be locked so if you are using third-party software to underclock the CPU you will need to adjust a few other values as well.

I'm using clockgen, what else would I need to change?
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a b K Overclocking
April 3, 2010 2:50:21 AM

What are the values/settings that have in your PLL control?
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a c 114 À AMD
April 6, 2010 3:59:41 AM

OvrClkr said:
What are the values/settings that have in your PLL control?

Ok, sorry I haven't been on in a few days, schoolwork had to be done. Here's what it says in clockgen now that I've set it back to 1.6GHz:

CPU - 1596MHz
FSB - 199.5MHz
RAM - 319.2MHz
PCIE - 100MHz
PCI - 33.33MHz
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a b K Overclocking
April 6, 2010 6:16:34 PM

The reason your system is crashing is becuase the PLL control is currupting the Bios settings. If you want to underclock the CPU you need to unlock your Bios and lower the FSB, your CPU multiplier is locked, there is no way of lowering that value.

I had the same issue with an old Dell lappy, I was able to unlock the bios but it would not let me change any setting other than the voltages and FSB settings.

The only AMD mobile CPU's that let's you lower the multi is the the Turion. Hope this helps..
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a c 114 À AMD
April 6, 2010 10:01:44 PM

Oh well, it's not worth all that trouble... thanks OvrClkr! :sol: 
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a c 114 À AMD
April 6, 2010 10:01:53 PM

Best answer selected by Avro Arrow.
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a b K Overclocking
April 6, 2010 10:05:55 PM

Avro Arrow said:
Oh well, it's not worth all that trouble... thanks OvrClkr! :sol: 


My pleasure buddy =)


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a b K Overclocking
April 6, 2010 10:06:07 PM

This topic has been closed by OvrClkr
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!