Intel HD Graphics 4600 vs Intel UHD Graphics 620 vs Intel HD Graphics (Sandy Bridge)

Intel HD Graphics 4600

The Intel HD Graphics 4600 (GT2) is a processor graphics card included in some of the Haswell processors of 2013. The base clock can be automatically overclocked using Turbo Boost technology.
Depending on the processor model, the base and turbo clock rates may differ greatly resulting in varying graphics performance between CPU models.

In comparison to the HD 4000, the graphics core has been modified extensively. The GPU supports DirectX 11.1, OpenCL 1.2 and OpenGL 4.0. It also features an improved decoder for 4K videos and the fast Quick Sync encoder.

According to Intel benchmarks in 3DMark 11, the HD Graphics 4600 will be up to 60 percent faster than the previous HD 4000. In our gaming benchmarks, however, the improvement was only about 30 percent. This performance boost is achieved by architectural improvements and an increased number of execution units: The GT2 version integrates 20 EUs, compared to 16 EUs for the old HD 4000. Thus, the HD 4600 not only matches some dedicated GPUs such as the GeForce GT 620M/630M, but also competes with the fastest integrated AMD GPUs like the Radeon HD 8650G.

Due to the 22nm 3D Tri-Gate production process, power consumption should be relatively low. The HD Graphics 4600 can be found on dual- and quad-core Haswell models in the 37 - 57 Watt TDP range.

Intel UHD Graphics 620

The Intel UHD Graphics 620 (GT2) is an integrated graphics unit, which can be found in various ULV (Ultra Low Voltage) processors of the Kaby Lake Refresh generation (8th generation Core). Compared to the similar named Intel HD Graphics 620 in the 2016 Kaby Lake CPUs, only the name changed from HD to UHD. It is clocked with up to 1.150 MHz and therefore 100 MHz higher than the old HD Graphics 620 (max. 1.050 MHz) and offer a comparable performance. Due to its lack of dedicated graphics memory or eDRAM cache, the HD 620 has to access the main memory (2x 64bit DDR3/DDR4).

Performance

The exact performance of the UHD Graphics 620 depends on various factors like L3 cache size, memory configuration (DDR3/DDR4) and maximum clock rate of the specific model and as is similar to the Intel HD Graphics 620 and Intel HD Graphics 630. Compared to the average HD Graphics 620, the UHD graphics profits from the quad-core CPU a bit in our gaming benchmarks. Therefore, should be positioned between a GeForce 910M and 920M dedicated graphics card from Nvidia. For games, the drivers however are not that fast updated and tested as with GeForce graphics cards. In our tests, the UHD 620 is most suited for casual games like Team Fortress 2, Rocket League or Farming Simulator 17. See below for a list of modern games tested with various models.

Features

The revised video engine now supports H.265/HEVC Main10 profile in hardware with 10 bit colors. Furthermore, Googles VP9 codec can also be hardware decoded. The first models do not support HDCP 2.2 and therefore Netflix 4K. This was added with the new models in 2017 and beginning of May 2017 also the older CPU models like the i3-7100U are now shipped with a new S-Spec Code that supports HDCP 2.2. HDMI 2.0 however is still only supported with an external converter chip (LSPCon).

Power Consumption

The UHD Graphics 620 can be found in mobile processors specified at 15 W TDP and is therefore suited for compact laptops and ultrabooks. The power consumption during playing The Witcher 3 (with an external monitor) was comparable to a Intel HD Graphics 620 based laptop and on the lowest end of all of our measurements. Dedicated GPUs, like the GeForce 940MX, needed a lot more power.

Intel HD Graphics (Sandy Bridge)

The Intel HD Graphics (Family) is a processor graphics card which is integrated in the cheap Celeron and Pentium model of the Sandy Bridge generation. It is similar to the Intel HD Graphics 2000 and not with the processor graphics of the older Arrandale dual-core processors (which bears the same name). 

Depending on the processor, the HD graphics offers a different base and Turbo Boost clock speed. Currently there are three different models:

• Power Saving e.g. Celeron 847: base 350MHz, Turbo 800MHz
• Celeron e.g. Celeron B810: base 650MHz, Turbo 950MHz
• Pentium e.g. Pentium B950: base 650MHz, Turbo 1100MHz

Furthermore, the slow CPU performance of some models may influence the games a lot. For example, although the GPU in the Celeron B710 differs not much from the Pentium B950, the gaming performance was clearly worse and many games were unplayable.

As the Intel HD Graphics 3000 and 2000, the processor graphics card is able to use part of the last level cache of the processor (2MB usually for the entry level CPUs). This could be seen as a small amount of very fast dedicated memory.

Altought 2x Antialiasing (AA) is supported, the chip is as fast as when rendering 4x AA. In the Unigine Valley benchmark a similar HD 3000 i7-2637M for example reached the same score with 2x AA and 4x AA.

The feature set compared to the HD Graphics 3000 is also reduced in these entry level CPUs. E.g. Intel Quick Sync (for de- and encoding of HD videos), In Tru 3D, Clear Video HD are usually deactivated.