AMD shows the first Fusion APU

And to get right to the point… Let’s look at the GPU performance.

While the Radeon HD 5450 has the same number of shader processors as the E-350 (80), they run faster and it has a dedicated 1.6GHz memory bus to feed it. The E-350 has to share memory bandwidth between the two Bobcat cores and the 80 SPs, severely limiting its performance potential.

Exactly what I’ve been saying all along: Even if you use a GPU of the exact same specs as a discrete card, it’s not going to be as fast, because of the shared memory bottlenecking the GPU.

Even in completely GPU-limited situations, it still doesn’t perform like a discrete card:

Compared to the Radeon HD 5450 the 6310 offers between 66 – 69% of its performance in our GPU bound tests. The performance reduction is entirely due to the 6310’s limited memory bandwidth being shared with the dual Bobcat cores on-die.

This is just a low-end Fusion chip, but the differences between high-end Fusion and discrete cards will only be larger, as the shared memory will only become more of a bottleneck compared to the discrete cards.

So although this is nice for a low-end desktop or notebook chip, people who thought they were going to get the performance of midrange discrete GPUs will be disappointed.

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One Response to AMD shows the first Fusion APU

  1. Pingback: AMD releases Fusion A8 series, codename Llano | Scali's blog

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