1066fsb CPU in a 800 system?

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Mikey9999

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Nov 26, 2013
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I found a Presario C769 laying by the road baking in the sun. Except for busted keyboard and weak battery it runs fine. I can get into BIOS using a USB keyboard and already installed Linux. But the T7280 CPU puts out a lot of heat. I've read the CPU can be upgraded to T9300. But I can get a T9400 a lot cheaper than t9300.

The t9400 has 1066fsb, what would happen if I try it in this computer? I think it would be great if it underclocks, the performance of current chip is fine but I want less heat and more battery.

Looking to spend about $75 for keyboard, CPU, 800Mhz 2gb memory and battery.
 
Solution
Obnoxious
The GL960 is similar to the GL40, it only accepts 800MHz FSB processors; inserting a 1066MHz CPU would be rejected by the BIOS and will fail to boot. The laptop only accepts 800MHz FSB processors, unless you apply the BSEL mod on a 1066MHz processor. Applying the BSEL mod will allow you to boot with the 1066MHz CPU, however it would be downclocked and provide poorer performance over the T9300.

I understand in your scenario you'd rather go with the more affordable T9400 rather than focus on performance, so without further ado I'll get into applying the BSEL mod. Just so you're aware, replacing the processor won't necessarily reduce the heat. If reducing heat is your only concern, you should consider reapplying thermal compound on the...
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Obnoxious

Obnoxious

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Jul 24, 2012
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This is another socket P laptop and usually are maxed out at 800MHz FSB. This is true on various chipsets, including the most common GL40. Please reply back with your chipset and I will provide additional details.

From my constant experience with socket P, I wouldn't bother trying an 1066MHz CPU; since in most occasions they are not compatible and the laptop will not boot. When upgrading you should adhere to 800MHz, the best in performance/value being the T9300.

Feel free to reply back with the laptop's chipset and I will provide additional details for your certain scenario. To find out your chipset, feel free to download CPU-Z and look under the mainboard tab.

All the best. :)
 
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Mikey9999

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Nov 26, 2013
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10,510
cpu-z reports GL960 rev C0; ICH8-ME rev B1; Motherboard is 30D9; BIOS rev F.35; Memory is DDR2 1Gb x2 PC5300

I can get a T9400 for $25. The best CPU known to work with a Presario C700 is T9500 (800fsb) and $150. The best 800fsb I am willing to pay for is a T7700 ($20)
 
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Obnoxious

Obnoxious

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Jul 24, 2012
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The GL960 is similar to the GL40, it only accepts 800MHz FSB processors; inserting a 1066MHz CPU would be rejected by the BIOS and will fail to boot. The laptop only accepts 800MHz FSB processors, unless you apply the BSEL mod on a 1066MHz processor. Applying the BSEL mod will allow you to boot with the 1066MHz CPU, however it would be downclocked and provide poorer performance over the T9300.

I understand in your scenario you'd rather go with the more affordable T9400 rather than focus on performance, so without further ado I'll get into applying the BSEL mod. Just so you're aware, replacing the processor won't necessarily reduce the heat. If reducing heat is your only concern, you should consider reapplying thermal compound on the processor along with cleaning the internals of the laptop (perhaps dust is blocking air from being exhausted?).

Applying the BSEL mod to downclock the 1066MHz to 800MHz requires physical modification to the laptop, albeit it a basic procedure. For the BSEL mod on socket P, I'd look at this thread.

If you're not comfortable performing the BSEL mod, then you should adhere to purchasing a 800MHz CPU.

All the best. :)
 
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Mikey9999

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Nov 26, 2013
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10,510
Update: the T9400 did not work (yes I did the mod), getting a T9300 from fleabay. Laptop still works with old CPU. Also I have 2GB 800 stick working in either slot with Win 7 SP1 and Linux. This means the 1GB limit on slot 0 is not there, another 2GB stick should give me 4GB dual channel 800. Before I took it apart I had it running with an Intel 3160 802.11 ac/b/g working in both OS.
Future upgrades: LED backlight with slide pot dremeled into cover, 128GB ssd. Total cost, including SSD about $150.
 
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