AMD Radeon RX 6600 XT specifications

Some exclusive information on upcoming mid-range Navi 23 based graphics cards from AMD has been revealed by Igor Wallossek.

AMD is set to launch its third graphics card based on RDNA2 architecture soon. This entry-level solution is clearly better suited for the mobile market, where light 1080p gaming and multimedia use are very popular. However, the GPU will also launch for the desktop market under Radeon RX 6600 series. Despite its small size, the GPU is set to compete with AMD’s own very popular RDNA1 based Radeon RX 5700 series thanks to various optimizations coming with RDNA2 architecture.

AMD Navi 23 GPU, Source: Igor’sLAB

According to Igor’sLAB, AMD Navi 23 has a die size of 235.76mm ² . It’s a 35x35mm package that features a die that is rotated by 45 ^o . This is nothing out of ordinary here. This GPU will come in various power brackets ranging from 90W to 65W (Total Graphics Power). It will be up to the notebook manufacturer to decide which TGP variant will their design support.

Igor was also able to gain access to a BIOS of Navi 23 Mobile Radeon SKU. Thus, we can see a much lower maximum clock speed than desktop variants (2350 MHz vs the rumored 2684 MHz).

AMD Navi 23 Mobile BIOS details, Source: Igor’sLAB

Memory and PCI Express

By far the most interesting part of the Igor’sLAB leak is the confirmation on memory and interface data. The graphics cards based on Navi 23 are to feature a maximum of 16GB of memory, but such a configuration would require 16Gbit (2GB) modules, which sounds like a waste for this entry-level SKU. At this moment it is clear that both Radeon RX models said to feature Navi 23 are 8GB. Higher-capacity models may arrive with the Radeon Pro series at some point though.

AMD Navi 23 Memory Configurations, Source: Igor’sLAB

The datasheet that Igor gained access to, reveals that Radeon RX 6600 series will have indeed have PCIe Gen4 interface, which is not surprising at all, but it also confirms that the card will rely on the x8 width of the interface. This entry-level model does not require a full x16 interface, because the bandwidth of PCIe Gen4 is already as good as on PCIe 3.0 x16.

AMD Navi 23 Interface Support, Source: Igor’sLAB

Igor also revealed details on thermal and power management on Navi 23:

AMD Navi 23 Temperature and Power Management, Source: Igor’sLAB

We have learned quite a bit about Radeon RX 6600 series in the past few weeks. These SKUs are said to launch by the end of this quarter, which heavily promotes the idea that we might hear about the Navi 23 graphics card at Computex.

AMD Radeon RX 6000 Series
	RX 6900 XT	RX 6800XT	RX 6800	RX 6700 XT	RX 6600 XT	RX 6600
GPU	Navi 21 XT(XH)	Navi 21  XT	Navi 21  XL	Navi 22 XT	Navi 23	Navi 23
Cores	5120	4608	3840	2560	2048	1792
TMUs	320	288	240	160	128	112
ROPs	128	128	96	64	32	32
Infinity Cache	128 MB	128 MB	128 MB	96 MB	64 MB	64 MB
Boost Clock	2250 MHz	2250 MHz	2105 MHz	2581 MHz	~2684 MHz	~2600 MHz
Memory Clock	16 Gbps	16 Gbps	16 Gbps	16 Gbps	16 Gbps	16 Gbps
Memory	16 GB GDDR6	16 GB GDDR6	16 GB GDDR6	12 GB GDDR6	8 GB GDDR6	8 GB GDDR6
Memory Bus	256-bit	256-bit	256-bit	192-bit	128-bit	128-bit
Bandwidth	512 GB/s	512 GB/s	512 GB/s	384 GB/s	256 GB/s	256 GB/s
TBP	300W	300W	250W	230W	<130W	<100W
MSRP	999 USD	649 USD	579 USD	479 USD	TBC	TBC
Launch Date	December 2021	November 2021	November 2021	March 2021	June 2021	June 2021

Source: Igor’sLAB