It looks like Intel may have replaced B820 with B830. Please see out post here.
The Celeron B830 sits right in the middle of the B820 and B840. It is clocked 100 MHz higher ( 1.80 MHz Vs 1.70 GHz). You should expect a performance improvement of the order of 5% though it is negligible and it will be hard to feel the difference.
Other specs are similar.
Table : Intel Celeron B820 Vs Intel Celeron B830 Feature Differences
|Feature||Intel Celeron B820||Intel Celeron B830|
|Core Frequency||1.70 GHz||1.80 GHz|
|No. Of Cores||2||2|
|Cache Organization||2 MB L3 Cache||2 MB L3 Cache|
|Turbo Frequency||No Turbo||No Turbo|
|TDP Rating||35 Watts||35 Watts|
|64 Bit Support||Y||Y|
|Lithography||32 nm||32 nm|
|Integrated Memory Controller||DDR3-1066/1333||DDR3-1066/1333|
|Integrated Graphics||Intel HD Graphics, 650 MHz Base, 1050 MHz Turbo||Intel HD Graphics, 650 MHz Base, 1050 MHz Turbo|
Some more details of Intel Celeron B820
The Celeron B820 belongs to the Sandy Bridge series of processor and is intended for the entry level notebook computing. You may like to check the core i3 and core i5 processors in the Sandy Bridge line if you are looking for high performance processors.
Some more details of Intel Celeron B830
The Celeron B830, another Sandy Bridge processor, sits exactly between the B820 and the B840. The processor does not has turbo boost and the Hyperthreading of the Core i3 and Core i5 Sandy Bridge processor. It is suitable for entry level notebook computing.