Aspire 5315 CPU Upgrade...FPS worse?

I have:

Aspire 5315
Core 2 Duo T5800 2ghz
Intel GM965 Express Chipset Family
2 gigs DDR2
Bios v1.34

I have researched this into the ground and there are two things I'd like to say: 1. I know my graphics card is not awesome. I'm aware and that's not the problem, so pretty please steer faarrrr away from any mention of my graphics card. Unless you'd like to also comment that it sucks. Or if it has something to do in tandem with my CPU.
2. PC upgrade is not possible at the time, so I'm not getting a new laptop. I'm just sayin. No need to wear out your fingers telling me I need a new laptop...This old Acer has done wonders for me with gaming and I really am just looking for any possible explanation as to why an upgraded CPU (and the *only* thing that has changed about my computer is the CPU) would cause my games to now be unplayable.

I just upgraded from a Celeron M. With the Celeron, Skyrim was playable, enjoyably so, on low settings. It would freeze from time to time on a loading screen, but playable. So I was happy. The Celeron isn't exactly gold, so I decided to upgrade (affordably) and snatched a Core 2 Duo to make me happier....Here's the problem: It didn't.
Now I can't play Skyrim. Not even remotely. It is absolutely, positively unplayable. I tried reinstalling...no help there. Disabled mods, etc. No change.

My question is: what in the world would cause that? I would understand if it didn't change much at all. I don't care if it even didn't change anything with my games. I can now video call my long-distance fiance and it no longer hitches, movies are better, etc. But why on earth did it make my fps worse??

 

Try installing ThrottleStop and locking the CPU on its highest multiplier while gaming.

Also, update your BIOS to 1.45.

 

We installed ThrottleStop and messed around with multiplier and voltage. Finally got it playable! Thanks, NetRolller.
We're going to flash the bios here in the next few days. Appreciate the helpful feedback.

 

Actually, we had to decrease the speed of the cpu from 2.0ghz to 1.6. This is obviously not ideal, but throttlestop didn't allow for the VID to go any higher than 1.25. The t5800 specs on the intel site - ( Intel® Core?2 Duo Processor T5800 (2M Cache, 2.00 GHz, 800 MHz FSB)) - say that it shouldn't need more than 1.175 volts, yet we can't seem to get performance out of it without forcing power down its throat at a lower speed. Any ideas as to what this may be?

Also, flashing the 1.34 BIOS to 1.45 - will this effect voltages, or how the system handles them? Or will it give an option to adjust it? I don't want to bother with flashing if it's not going to solve the problem, and I believe we've isolated it to a voltage issue.

Thanks in advance for any replies.

 

Why do you need to give it more than 1.25V? Throttling doesn't indicate too low voltage - it means the CPU is overheating.

 

I've watched the temperatures, and it shows no signs of overheating. And if throttlestop is doing what it says it's doing, then it's been running for 2 days now at 1.25v better than it has ever run with the new cpu. Performance isn't fluctuating either. It's a steady, measurable underperformance.

 

You know, you can upgrade the motherboard to that of a 5720g and install an MXM card like the 9600m GT. The motherboard is only about 50$.