CPUs > Less than 700 MHz CPUs > Socket 7

Advantages: Good price, life time warranty, new technology for old pc's
Disadvantages: Might work as a bottle neck, if your pc lacks RAM

The evergreen Spectra 333 is a direct replacment for you old Pentium CPU, it replaces Pentium 75Mhz and up and offers a big boost in performance. The upgrade uses an AMD K6 II as the CPU and comes on an adapter board that alters the voltage to make it compatable with your system, the heatsink and fan are also provided as are BIOS updates. It also uses 3D Now technology to provide extra support for graphics in games and general applications. If you ...
...to upgrade the motherboard and processor, then the Spectra 333 is an affordable compromise for your system. The price may seem high at first until you take into account that a new motherboard and memory are not required. The price is around the £120 mark, but cheaper ones are available. Easily a good choice if your old computer can not keep up with todays new applications. Also easy to fit. The upgrade has a life time warranty and technical support ... Read review

Advantages: Easy to install,Lifetime guarantee and support,damn fast processor
Disadvantages: Not suitable for beginners

I had an old Pentium 100mhz CPU computer, which I inherited,and it seemed a tad slow (for good reason!).I had seen this upgrade available at various mail-order firms and saw that it was available for socket 7 motherboards,at Pentium 75mhz upwards. The upgrade itself is a AMD-K62 400mhz processor with heat sink and fan.It has instruction sheets and the necessary disks to alter your BIOS and to benchmark both your old and new processor speeds. I ...
...had no motherboard manual,I was relatively pleased with the ease of installation.It has a lifetime guarantee and lifetime phone technical help. I had to phone the technical support once, they were very helpful and useful,and resolved my problem quickly. If you want your old pentium to be up to 400% faster,with MMX and 3DNOW! then I would thoroughly recommend this product... ... Read review

Advantages: Stable Temperature.
Disadvantages: -

...XP SP2. I like this AMD processor because have dual core system and more faster than Intel Pentium Core Duo 2.2Ghz. I use ECS GeForce6100PM-M2 mainboard, DDR2 1Ghz, onboard VGA sharing up to 512MB. Then I try run The Sims game and wow.... I don't believe it, run stable and quick load when play. I can play NBA Live 2007 game too without using PCI-E VGA card. This AMD processor very quiet and the temperature is always stable. I try it all using original ... Read review

Advantages: fairly good price, dual core, 2.66 ghz, 4m L2 cache
Disadvantages: fan is somewhat hard to install

This E6750 is the processor running in my computer as I write this review. In my opinion I couldn't have chosen a better CPU for what I was looking for. I was looking to spend around 200 USD for a processor and I wanted it to be very powerful so that I could run demanding programs and all of the most recent games. This processor combined with my 8800 gts 320md graphics card put on a show when it comes to graphics displays. I have yet to be disappointed ... Read review

Advantages: Quite Fast, Overclockable, Cheap
Disadvantages: 1mb cache

I have had this processor in my PC for around 7 months and it is probably the best value processor around. I put it i my first ever build and it was very easy to install and very fast,probably the fastest PC I had ever used! After a few days I messed aroung with overclocking and this is when I really unlocked its potential. I don't really have a clue about memory timings etc. so anything extra I could get out of it the better. I could get it up ...
...but its now sitting at 3Ghz as it has been for 7 months and it flies! I have played quite a few games with it including COD4, PES 2008, FIFA 08, GTA SA, Half Life 2 and more, very smoothly. I can also convert a 2hr film to DVD in around 50 mins, on my old computer it would take 4hrs. Overall a cheap and Cheerful processor ... Read review