Along with the Ryzen 5000 notebook processors, AMD also silently launched the Ryzen 7 5800 and 5900 for SIs and OEMs. Although these chips are technically slower and cheaper than the 5800X and 5900X available in the retail market, some leaked benchmarks show that they perform pretty much the same when unlocked.
And by unlocking, I mean simply turning on Precision Boost Overdrive (PBO) which generally improves multi-threaded performance while not having much of an impact on the single-threaded figures.
However, as you can see in the above benchmarks, the resultant performance with a 5800 is the same as its more expensive X variant. Even with PBO enabled on the 5800X, the 5800 offers roughly the same level of performance. This can be explained by analyzing the operating clocks of the 5800.
As is evident in the first image, the boost clock on the 5800 easily hits 4.8GHz with PBO turned on, showing an increase of nearly 25% over the stock boost clocks. The 5800X sees a much lower increase in both clocks and performance (esp. single-threaded) when compared to the 5800. This means that the 5800 is largely limited by the TDP which is overcome with PBO turned on. Unfortunately, the 5800 and 5900 are both expected to be limited to pre-built PCs, and won’t come to the retail market anytime soon.