AMD Phenom BIOS Fix Causes 14% Performance Hit
Written on December 7, 2007 – 6:02 pm | by admin
As many readers may be aware, there is an erratum (a mistake in the design) of AMD’s recently launched Phenom CPU. Basically it’s a problem with the CPU’s translation lookaside buffer (TLB) and L3 cache, which can lead to crashes and data corruption.
This was quickly discovered, and AMD issued a BIOS fix in response. However, recent tests carried out by The Tech Report found that as a result of this fix, memory bandwidth fell by as much as 38.7% whilst the latency increased by over 50%. When they tested the real world performance hit caused by this, they found it ranged from around 5% to as much as 50% in everyday applications, with an average performance drop of 13.9%. This issue should be fixed in any CPUs manufactured in the future, but things look quite bleak for anyone who has already purchased a Phenom processor, and it would be best not to buy one until all of the ‘faulty’ processors have either been sold or recalled. This is very bad news for AMD, considering that it has already been struggling to make a profit for quite a few months now.
