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AMD Navi 23 Radeon RX 6600 series to feature 8 GB GDDR6 and PCIe Gen4 x8 for both desktop and mobile variants, can potentially compete with the RX 5700 series

AMD Radeon RX 6600 Navi 23 could compete with the RX 5700 series. (Image Source: AMD3D)
AMD Radeon RX 6600 Navi 23 could compete with the RX 5700 series. (Image Source: AMD3D)
Information about AMD's upcoming Navi 23-based Radeon RX 6600 and RX 6600 XT has now surfaced. The RX 6600 series will be available in both mobile and desktop offerings and is expected to feature up to a 2,350 MHz boost clock, 8 GB GDDR6 VRAM, and PCIe Gen4 x8 connectivity. The PCIe Gen4 x8 limitation may be a deterrent for those looking to upgrade to Navi 23 on the desktop.
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By now, it is clearly evident that AMD is on course to launch a Navi 23 RX 6600 and RX 6600 XT GPU soon. The RX 6600 series is slated to cater to the entry-level to lower midrange segment and is based on the RDNA 2 architecture. While Navi 23 definitely makes for a good laptop GPU, new information points to a desktop version in the offing as well. As usual, igor'sLAB is back once again with all the juicy details. 

According to Igor, the Navi 23 chip measures 16.51 mm x 14.28 mm (35 mm x 35 mm for the complete package) yielding an a die area of 235.76 mm2. For perspective, the Navi 22 RX 6700 series has a die area of 335 mm2 while the Navi 21 (RX 6800 XT and RX 6900 XT) is the largest of the RDNA 2 parts at 520 mm2

AMD is expected to offer at least three Navi 23 GPU choices. Laptop OEMs can choose between 90 W, 80 W, and 65 W TGPs depending on their chassis design and cooling targets. Igor also had access to a Navi 23 mobile BIOS (we assume it's the top-end variant) that indicates a clock speed of 2,350 MHz (the desktop variant is speculated to sport 2,684 MHz). 

On the memory front, Navi 23 can, theoretically, support up to 16 GB GDDR6. Since the target use case will not necessarily benefit much all that RAM, both the Navi 23 models are expected to feature 8 GB GDDR6 VRAM on a 128-bit bus with a possibility of higher RAM variants down the line for the Radeon Pro series. 

The RX 6600 series will use a PCIe Gen4 interface, but with x8 lanes instead of x16. This makes sense considering that PCIe Gen4 x8's throughput is equivalent to that of PCIe Gen3 x16 and should be plenty enough for FHD Ultra gaming. While the reduction in lanes also translates into power savings in laptops, it does not make for an impressive spec on the desktop side, especially for those with Gen3 slots looking at Navi 23 as an upgrade.

On the connectivity side, Navi 23 supports DisplayPort 1.4a (or 4x DisplayPort + 1 USB-C), HDMI 2.1, and single-link DVI (SL-DVI) across laptops and desktops along with VP9 decode, HEVC decode, H.264 decode, and VC1 decode capabilities. AV1 decode status is not yet clear but is likely to be present.

Overall, if this information is true, it looks like AMD may have a capable Navi 23 offering that can potentially be equivalent to the Navi 10-based RX 5700 series in terms of performance. Igor also has posted information about the RX 6600's power and temperature management, which is included in the images below. The Navi 23-based RX 6600 series is expected to launch some time in June this year.

Buy the Sapphire Nitro+ AMD Radeon RX 6700 XT on Amazon

Navi 23 RX 6600 chip marking format. (Image Source: igor'sLAB)
Navi 23 RX 6600 chip marking format. (Image Source: igor'sLAB)
Navi 23 RX 6600 package dimensions. (Image Source: igor'sLAB)
Navi 23 RX 6600 package dimensions. (Image Source: igor'sLAB)
Navi 23 RX 6600 mobile BIOS. (Image Source: igor'sLAB)
Navi 23 RX 6600 mobile BIOS. (Image Source: igor'sLAB)
Navi 23 RX 6600 memory specifications. (Image Source: igor'sLAB)
Navi 23 RX 6600 memory specifications. (Image Source: igor'sLAB)
Navi 23 RX 6600 PCIe Gen4 features. (Image Source: igor'sLAB)
Navi 23 RX 6600 PCIe Gen4 features. (Image Source: igor'sLAB)
Navi 23 RX 6600 display outputs. (Image Source: igor'sLAB)
Navi 23 RX 6600 display outputs. (Image Source: igor'sLAB)
Navi 23 RX 6600 power management. (Image Source: igor'sLAB)
Navi 23 RX 6600 power management. (Image Source: igor'sLAB)
Navi 23 RX 6600 thermals. (Image Source: igor'sLAB)
Navi 23 RX 6600 thermals. (Image Source: igor'sLAB)
 

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Vaidyanathan Subramaniam
Vaidyanathan Subramaniam - Managing Editor - 1357 articles published on Notebookcheck since 2012
Though a cell and molecular biologist by training, I have been drawn towards computers from a very young age ever since I got my first PC in 1998. My passion for technology grew quite exponentially with the times, and it has been an incredible experience from being a much solicited source for tech advice and troubleshooting among family and friends to joining Notebookcheck in 2017 as a professional tech journalist. Now, I am a Lead Editor at Notebookcheck covering news and reviews encompassing a wide gamut of the technology landscape for Indian and global audiences. When I am not hunting for the next big story or taking complex measurements for reviews, you can find me unwinding to a nice read, listening to some soulful music, or trying out a new game.
contact me via: @Geeky_Vaidy
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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2021 05 > AMD Navi 23 Radeon RX 6600 series to feature 8 GB GDDR6 and PCIe Gen4 x8 for both desktop and mobile variants, can potentially compete with the RX 5700 series
Vaidyanathan Subramaniam, 2021-05-19 (Update: 2021-05-19)