RX 6800 XT Smart Access Memory Performance Comparison!


Find out what AMD Smart Access Memory is all about, and how much of a performance effect it really has on the Radeon RX 6800 XT graphics card!


RX 6800 XT Smart Access Memory : How Does It Improve Performance?

Smart Access Memory is really a marketing term for AMD’s implementation of the PCI Express Resizable BAR (Base Address Registers) capability.

CPUs are traditionally limited to a 256 MB I/O memory address “window” for the GPU frame buffer.

Turning on Resizable BAR or Smart Access Memory removes that small access window, letting the CPU directly access the Radeon RX 6800 XT‘s graphics memory.

While the AMD graphics above suggest that Smart Access Memory will widen the memory path, and thus memory bandwidth, between the CPU and GPU, that’s not true.

It does not increase memory bandwidth. Instead, it speeds up CPU to GPU communications, by letting the CPU directly access more of GPU memory, instead of using the usual 256 MB “window”.

Recommended : AMD Smart Access Memory – How To Enable It?


RX 6800 XT Smart Access Memory : 3DMark

The 3DMark benchmark results don’t show any significant performance difference, with Smart Access Memory enabled.


RX 6800 XT Smart Access Memory : Game Performance Summary

But let’s look at its effect on the real world gaming performance…

Let’s start with a bird’s eye look at the performance effect of Smart Access Memory on the Radeon RX 6800 XT‘s performance.

For more detailed look at Smart Access Memory’s effect on each game, please click to the next page.

1080p Resolution (1920 x 1080)

At 1080p, Smart Access Memory improved frame rates by about 4.33%, and does not always give a performance boost to the Radeon RX 6800 XT.

It had virtually no performance effect in World War Z, The Division 2 and Star Control : Origins.

On the other hand, it delivered up to 16% better frame rates in Total War : Troy.

1440p Resolution (2560 x 1440)

Smart Access Memory had a bigger (5.22% average) effect on the Radeon RX 6800 XT at 1440p.

It had no effect in four games – Metro Exodus, World War Z, The Division 2 and Star Control : Origins.

But it has a large 10%-11% performance boost in F1 2019, Total War : Troy, Dirt 5 and Gears Tactics.

2160p Resolution (3840 x 2160)

At the 4K resolution though, the average performance boost from Smart Access Memory dropped to just 3.11%.

Most of the games had insignificant boosts in frame rates of 2-3%. Oddly enough, World War Z received a significant 4% boost in frame rate at 4K.

F1 2019 received the biggest boost from Smart Access Memory – a large 14% boost in frame rate!

Next Page > RX 6800 XT Smart Access Memory Game Performance


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