AMD Ryzen 7 H 255 vs AMD Ryzen 7 8745H

AMD Ryzen 7 H 255

The Ryzen 7 H 255 is a chip from the Hawk Point family that is only available in China. The chip is identical to the older Ryzen 7 8745H and has 8 cores (16 threads thanks to SMT support) that run at up to 4.9 GHz, together with the still quite powerful Radeon 780M iGPU. An NPU for AI acceleration is not installed / activated.

The only difference between the 8745H and the 8745HS is the slightly higher standard wattage of the former, which may lead to slightly higher clock rates.

Performance

We expect this Zen 4 architecture processor to be about as fast as the Ryzen 7 7745HX (8 Zen 4 cores, 3.6 GHz to 5.1 GHz), meaning its multi-thread performance is slightly better than that of the Core Ultra 9 185H but a few percentage points behind the Ryzen AI 9 HX 370.

Architecture and features

Unlike Zen 3, Zen 4 offers AVX512 support along with other improvements such as larger caches/registers/buffers across the board. Otherwise, the 8745H has 16MB of L3 cache and a fast RAM controller (up to LPDDR5x-7500 and up to DDR5-5600). There are 20 PCI-Express 4 lanes for connecting devices such as NVMe SSDs (1.97 GB/s per lane) and graphics cards; USB 4 / Thunderbolt support is also on board. Please note that the APU is not overclockable and cannot be replaced by the user. It is permanently soldered to the motherboard (FP7r2 or FP8 socket interfaces).

Graphics

The Radeon 780M (12 CUs / 768 shaders, up to 2,600 MHz) can drive 4 monitors simultaneously with a resolution of up to SUHD 4320p. Hardware encoding and hardware decoding of the most common video codecs (AV1, AVC, HEVC) is also no problem. As far as games are concerned, many titles can still be played in 1080p at the beginning of 2025, even if most settings are set to Low or Low.

Power consumption

This Ryzen 7 series chip has a long-term power limit (standard TDP) of 35W to 54W, giving system manufacturers the choice of either improving battery life or making the system they are developing faster. In any case, an active cooling solution is a must for a notebook or mini PC equipped with this APU.

AMD Ryzen 7 8745H

The Ryzen 7 8745H is a China-only Hawk Point family chip that never received an official launch. Targeted at gaming and productivity laptops but widely used in mini-PCs, too, the 8745H features 8 cores (16 threads thanks to SMT support) running at up to 4.9 GHz, along with the still fairly capable Radeon 780M iGPU. There is no NPU here.

As an APU meant for use within China, this Ryzen 7 should be fully compliant with the Chinese government-approved cryptography standards.

The only difference between the 8745H and the 8745HS is the slightly higher default wattage of the former, potentially leading to slightly higher clock speeds.

Performance

We fully expect this Zen 4 architecture processor to be about as fast as the Ryzen 7 7745HX (8 Zen 4 cores, 3.6 GHz to 5.1 GHz) meaning its multi-thread performance is a little better than the Core Ultra 9 185H but a few percentage points behind the Ryzen AI 9 HX 370.

Architecture and Features

Unlike Zen 3, Zen 4 features AVX512 support along with other improvements, like larger caches/registers/buffers across the board. Elsewhere, the 8745H has 16 MB of L3 cache and a fast RAM controller (up to LPDDR5x-7500 and up to DDR5-5600). There are 20 PCI-Express 4 lanes for connecting devices such as NVMe SSDs (1.97 GB/s per lane) and graphics cards; USB 4 / Thunderbolt support is onboard, too. Please note that the APU isn't overclockable and neither is it user-replaceable. It gets soldered on to the motherboard for good (FP7r2 or FP8 socket interfaces).

Graphics

The Radeon 780M (12 CUs / 768 shaders, up to 2,600 MHz) can drive 4 monitors simultaneously with resolutions as high as SUHD 4320p. It will also have little issue hardware-encoding and hardware-decoding the most widely used video codecs (AV1, AVC, HEVC). As far as gaming is concerned, many titles are still playable at 1080p as of early 2025 albeit with most settings dialed down do Lowest or Low.

Power consumption

This Ryzen 7 series chip has a long-term power limit (default TDP) of 35 W to 54 W, giving system makers a choice between improving battery life and making the system they're designing faster. Either way, an active cooling solution is a must for a laptop or a mini-PC built around this APU.