CPUs > 100 GBP to 199 GBP CPUs

Advantages: Dual-core performance for true multi-tasking
Disadvantages: Price a little bit more, but makes sense.

...in today's mainstream notebook PCs AMD Athlon 64 X2 6400+ / 3.2 GHz processor has given me a sigh of relief. So what's it bringing with itself? AMD64 technology brings your notebook PC to life with dual-core performance, superior graphics, and wireless technologies from AMD's technology partners. It's everything you need for an enhanced Windows Vista™* experience you can take with you anywhere and coming with a price that makes sense. # Key features ...
...and wireless capabilities from AMD technology partners ~AMD PowerNow!™ technology for performance on demand and extended system battery life ~Enhanced Virus Protection** (EVP) helps protect against certain viruses, worms, and other malicious attacks ~HyperTransport™ technology boosts overall system agility so applications are more responsive and deliver incredible performance # Compatibility wise: AMD Athlon 64 X2 dual-core processors for notebook ... Read review

Advantages: Price, Performance
Disadvantages: Single Core

This chip is from AMD's last generation architecture using the 939 socket. Due to the new AM2 architecture being released, socket 939 chips have plummeted in price as they are no longer cutting edge. This means there are bargains to be had and this opteron is one of those chips. Around 60 pounds buys you a single core 2Ghz processor which is nothing special. What you are not told is these chips actually use server grade silicon and have 1Mb level ...
...level 2 cache found in the desktop equivalent. This, in theory, should allow the chip to be overclocked more heavily and therefore perform much better. At stock the chip is quick and performs well in games. However, this chip is not bought to run at stock its bought to be heavily overclocked. Loading up the chip into my pc, which uses swiftech watercooling, I proceded to overclock the chip as much as possible on stock volts. This yielded a clock ... Read review

Advantages: quad-core design handles data efficiently; cheaper than competing Intel quad-core chips.
Disadvantages: Expensive

...for its subpar performance. Unless AMD drops prices more aggressively, it looks like Intel will maintain its grasp on the CPU market for the foreseeable future. For raw performance, AMD's Athlon 64 X2 chips have lingered behind their Intel Core 2 Duo counterparts all year. Only aggressive pricing from AMD kept its old dual-core CPUs in systems and on store shelves. According to our testing, AMD will have to work similar magic with its new quad-core ...
...you can find a prebuilt PC that uses a Phenom 9500 for significantly less than a similar desktop with an Intel Core 2 Quad Q6600, go for it. But unless you can find it for an exceptional price, we advise against the Phenom right now, because its performance simply isn't there. ... Read review

Advantages: fast and responsive (though ciao's still slow)
Disadvantages: ummm it's not a quad core

had this cpu for week now happy with the performance in desktop applications, and in gaming; in counter strike source my fps is now between 60-70 running the cpu at stock which is ace. The three best aspects of this processor is the dual core, which helps immensely with multi tasking so if you are like me get bored easily and try and do many things at once this cpu will deal with it fine. Secondly the cache size is a really healthy 2mb which delfinately ... Read review

Advantages: Good clock speed, good video decoding and overall reliabilty
Disadvantages: Only 2 MB cache

The Core 2 Duo e6400 has many good features: It uses a 1066 MHZ FSB (front side bus) for a fast link on the motherboard. It 2 cores running at 2.13 GHZ The Processor is very EASY to overclock; just be careful. It is energy effecient and runs cool, unless you over clock Not as good features: 2 MB cache low compared to others in the range I found this processor to be excellent; it was extremely fast. With this processor there is no worry of ... Read review