Both models
3300U and
3700U are based on
Zen+ architecture.
Zen+ is the second generation of Ryzen processors. It uses the 12nm process by GlobalFoundries. Other than that, the die is the same than first generation Zen. It comes with 64kB of L1 cache and 512kB of L2 cache per core. There are 3 variants: Pinnacle Ridge (desktop), Colfax (high-end desktop) and Picasso (APU).
Using the multithread performance as a reference, the 3300U gets a score of
139.6 k points while the 3700U gets
157.2 k points.
Summarizing, the
3700U is
1.1 times faster than the
3300U. To get a proper comparison between both models, take a look to the data shown below.