CPUs > AMD CPUs > Quad-Core > 100 GBP to 199 GBP

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: 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

Advantages: fast
Disadvantages: hard to think of one

This intel dual core processor with 2.4Ghz speed (total speed of 4.8Ghz) with a 2MB Cache can handle an awful lot of demanding programs runnning at once and for the amazingly low price its a very good processor. This processor is also compatable with 64 bit computing. It has an LGA775 Socket which is compatable with most motherboards (up to you to check these things) if you are looking to upgrade or build your own pc. If you are looking to buy a ... Read review

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: Very fast, cheap
Disadvantages: need to have IT expereince

This intel dual core processor with 2.33Ghz speed (total speed of 4.6Ghz) with a 4MB Cache can handle an awful lot of demanding programs runnning at once, obviously it has its limits, but for the price its a very good processor. This processor is also compatable with 64 bit computing. It has an LGA775 Socket which is compatable with most of the new motherboards if you are looking to upgrade or build your own pc. If you are looking to buy a processor ... Read review