[King1st]

The Bulldozer design had a few main issues.

1.Bulldozer had a very long pipeline akin to a Pentium 4. This allows for highclocks but comparatively little work being done per cycle vs their competition. Since clocks have a ceiling around 5GHz they could never push the clocks high enough to compete with intel. 2.They used a odd core design with 1 FPU for every 2 integer unit instead of the normal 1:1 that we have seen on every x86 since the i486. This leads to very weak FPU performance needed for many professional applications. Conversely it allowed for very competitive performance on highly threaded integer applications like rendering. This decision was probably under the assumption APUs would integrate their GPUs better and software would be written with it in mind since a GPU easily out does a CPUs FPU but it requires more programming. This didn't come to be. 3. They were stuck using Global Foundries due to previous contracts when they spun it off requiring AMD use GloFlo. This became a anchor as Gloflo fell behind market competitors like TSMC. Leaving AMD stuck on 32nm for a long while, until gloflo got 14nm and eventually AMD got out of the contract between zen 1-2.

bonus: Many IC designers have bemoaned how much of bulldozers design was automated with little hand modifications which tends to lead to a less optimized design. 3. 3.