jbone1337 Wrote:Well the 3650 is rated higher then a 5470m, due to the 128bit bus compared to the 64bit bus, so it will have a higher memory bandwidth. And it has 40 more unified shaders, but a slower core/shader clock rate (reference clock), and a slower memory clock.
It doesn't matter whether the higher shader throughput is due to a higher SP clock rate or higher SP count. All that matters is that it has a higher shader throughput. Likewise it does not matter if the higher memory bandwidth is due to a higher memory clock rate or wider memory bus. All that matters is that it has a higher memory bandwidth.
These are by far the two most important specs other than architecture (and we already discussed why the different architecture won't significantly impact performance). Pixel, vertex, and texture fillrates have essentially become almost useless specs in modern games since they are almost always bottlenecked by video memory bandwidth and modern games are shader driven. Take a look at any modern game benchmark and you'll see what I mean. If the SP architecture is the same usually the only specs that drive performance are peak shader throughput and video memory bandwidth.
Quote:But in actual gaming performance at a 720P resolution (1280x720/1366x768), they will score about the same (3650 would get maybe 1-2 fps more lol), which that level of difference is negligible.
If you were playing at like 640x480 or something, there would be a larger difference in performance between the 2. But really thats not a real world benchmark when benchmarking a gpu, since no one is ever going to be really playing at that resolution....
I really doubt this. Common sense dictates that if all of the important specs are much higher and the SP architecture is the same the performance will be much higher unless there is an outside bottleneck. It's a much faster chip so why would it perform almost the same? It should perform 45% better under a worst case scenario (difference in shader throughput) and 90% better under a best case scenario (difference in memory bandwidth) if I'm not mistaken.
Now I have posted a reputable source stating a significant performance difference between the two. You have only provided one source so far. And your source is a notoriously unreliable benchmark that pits the 5470m against the AGP version of the 3650 (which is much slower than the PCI-E version, especially in synthetic tests) and doesn't state whether the 3650 is the more common GDDR3 variant or the less common DDR2 variant. Considering that the 3650 is only scoring 2/3 as high as the 5470m in that benchmark it's safe to say that the AGP bus is severely degrading its performance. This is why I hate passmark, wacky out of place results all over the place. The 3650m by the way has the same low 120 GFLOP/s throughput and 22.5 GB/s of memory bandwidth. Unless the test system was using poorly optimized drivers (which could be the case since these are user benchmarks not professional benchmarks) common sense would once again dictate the the performance would be the same or higher yet is is 17% lower. Once again something is clearly off. This is why you need to find professional benchmarks, preferably games. Otherwise you end up with this kind of nonsense.
Also for the record GPUs with siginficantly higher video memory bandwidth but similar shader throughput show higher performance deltas at higher resolutions.
GPUs with siginficantly higher shader throughput but similar video memory bandwidth show higher performance deltas
at lower resolutions.
GPUs with siginficantly higher video memory
bandwidth and significantly higher shader throughput show high performance deltas
at all resolutions. The difference in performance deltas between higher and lower resolutions depends on how much higher or lower the video memory bandwidth delta is compared to the shader throughput delta.
This of course all assumes a GPU bottleneck.
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-Ron Swanson
"I shall be a good politician, even if it kills me. Or if it kills anyone else for that matter. "
-Mark Antony