AMD Radeon RX 6900 XT GFX Clock Limit Is 3.0 GHz Which Is 200 MHz More Than RX 6800 XT and RX 6800 Graphics Cards

AMD’s latest RDNA 2, Big Navi Graphics Cards, the AMD Radeon RX 6000 Series have slightly different internal configurations. However, the company has locked down the graphics processor frequency of all the variants. If over-clockers can somehow manage to break the lock, the AMD Radeon RX 6800 XT could offer very similar performance to the flagship AMD Radeon RX 6900 XT, eroding the value of the latter.

The upcoming AMD Big Navi flagship Graphics Card, the Radeon RX 6900 XT, has a higher clock limit than both the AMD Radeon RX 6800 XT and AMD Radeon RX 6800 graphics cards. This is a deliberate and intentional decision to ensure the flagship graphics card offers more than the mid-range cards.

AMD Radeon RX 6800 XT Can Match Performance of AMD Radeon RX 6900 XT If GFX Clock Limit Is Broken?

AMD Radeon RX 6800 XT has 72 Compute Units. However, it is a variant of the Navi 21 GPU. Needless to add, the AMD Radeon RX 6900 XT has an identical GPU design. The Radeon RX 6800 XT started arriving last week with customizations from AMD board partners.

Detailed analysis of the graphics card revealed that the AMD Radeon RX 6800 XT has a maximum allowed GFX Clock (graphics processor frequency) locked to 2.8 GHz. AMD has clearly laid down this limit. What this means is that even with severe modifications, no AMD board partners, reviewers and extreme over-clockers have been to go higher.

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There might be a technical reason for limiting the GFX Clock on the AMD Radeon RX 6800 XT. However, the real reason appears to be limiting slightly lower-end variants of the Big Navi 21 GPUs from performing at par or even better than the flagship AMD Radeon RX 6900 XT.

The AMD Radeon RX 6900 XT has 80 Compute Units. It appears to have a higher limit on the GFX Clock. According to the latest reports, the flagship AMD Big Navi Graphics Card has a GFX Clock limit set to 3.0 Ghz. Needless to mention, with such a generous limit, over-clockers have sufficient headroom. Moreover, AMD’s board partners can attempt to push the abilities of the flagship GPU with custom cooling solutions and radical designs.

Over-Clockers Need Specific Software Over-Clocking Tools From AMD Directly?

Incidentally, both the AMD Radeon RX 6900 XT and its slightly lower-end variant, the AMD Radeon RX 6800 XT, have the same TGP of 300 Watts. They even have similar reference clock speeds. This means, with identical GFX Clock limits, over-clockers could manage to make the RX 6800 XT work and behave very similar to RX 6900 XT in terms of raw performance.

With 5120 Stream Processors, the RX 6900XT is set to compete with NVIDIA’s GeForce RTX 3090 model. The price difference between the two is quite large. However, none of these cards are available easily. In fact, these cards have been reported to have exceptionally high performance in cryptocurrency mining. Hence, extremely limited quantities of both the cards are expected to command very high prices whenever they surface online.

Alap Naik Desai


A B.Tech Plastics (UDCT) and a Windows enthusiast. Optimizing the OS, exploring software, searching and deploying solutions to strange and weird issues is Alap's main interest.