The Deck is using Zen 2 cores, which are extremely fast and energy efficient and they're tied to some very fast memory which will boost performance up nicely. This isn't exactly the case on the Deck-it'll be bottlenecked by what 8 compute units can do.įinally, the CPU itself. Don't quote me, I'm not sure of the exact specs yet, but given the 5500 MT/S # that Valve quotes, that should be 176 gb/s on the Deck's system memory? Latency is often better on APU's from what I understand APU's tend to be bottlenecked by the memory. TPU quotes your card as having 112 gb/s of memory bandwidth at its disposal. Meanwhile, Valve has stuck quad channel LPDDR5 (or low power double data rate 5-despite the naming scheme they are not DDR5 modules and are incompatible with DDR5), which is new and very fast. Dedicated RAM is normally superior, but to save on energy, Nvidia is using a very narrow 128 bit-bus on your 4GB of graphics memory. APU's are stuck on using the system RAM your GPU has its own dedicated RAM. If you could tune the GPU to 20 watts, I would have no doubt. But, can it do that at 12 watts? I'm doubtful, to be honest. Valve quotes the Deck at being 1.6, and both RDNA1 and especially RDNA2 get closer to their theoretical performance in gaming than the 1000 series cards do. The theoretical floating point performance is 1.45 TFLOPS, or tera-floating point operations per second. Despite being the most energy-efficient 1050 Nvidia could make, it's not actually that energy efficient. Since your laptop is much larger and has this big 75w GPU, that means there's no chance the deck can compete, right.? Well, no. That's the kind of design situation Valve is in with the Deck-it's not possible to get enough power into its form factor. You could run the Pi at 25w, but nobody makes a 5v power supply that big. We actually see this with the Raspberry Pi 4B: performance is thermally limited first-it takes heat piping or similar to really tame it at 18w-and then power limited second. That's not the kind of tethered experience Valve is pushing here. Your laptop can and will use 75w on the GPU alone, and your battery will go flat in under 2 hours. The Deck is designed more like an uber-tablet. Your laptop is actually not designed according to these principles. I suspect this will quickly become 20w or 25w with a setting or switch in the software, and most power users will just get used to carrying around a battery bank (or modifying one in!) as the Deck's batteries are small. The CPU and GPU share power! In other words, if the GPU is using 12w, the CPU can only consume, at most, 3 watts. On an APU and for mobile applications in general, there's not a free lunch in power usage. For gaming, though, 15w is the number you'll expect to see. Valve quotes 15w peak average wattage, but not a peak burst wattage. All of that electricity gets turned to heat, and that heat has to go somewhere. The smaller the form factor, the less power you can reasonably expect to be able to dissipate. One of the supposed benefits of RDNA2 over RDNA1 is increased performance per watt this is very important because: They're using an RDNA2 GPU, but the newest APU's only use RDNA1. Valve has custom-ordered an APU from AMD for this device.
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