AMD Radeon RX 6600 series to feature up to 8GB GDDR6 memory and PCIe Gen4 x8 interface

Published: 17th May 2021, 06:40 GMT   Comments

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 235.76mm2. It’s a 35x35mm package that features a die that is rotated by 45o. 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 XTRX 6800XTRX 6800RX 6700 XTRX 6600 XTRX 6600
GPUNavi 21 XT(XH)Navi 21  XTNavi 21  XLNavi 22 XTNavi 23Navi 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
TBCTBC
Launch DateDecember 2021November 2021November 2021March 2021June 2021 June 2021

Source: Igor’sLAB




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