have you ever taken your shiny new graphics card home only to be
disappointed at how you can't turn the settings up as far as you want in some hyped up AAA game it turns out that in
many cases this isn't because the GPU is underpowered instead you might not have
enough video memory or the amount you do have might just be too slow but the next
generation of vram gddr7 promises to
help alleviate some of these issues with never before seen bandwidth this is a
big deal because of the rapidly increasing demands being put on gaming
PCs where the high resolution textures and complex visual effects of big name
titles can overload all but the highest End Hardware meaning you need enough
high-speed vram to hold all that data that the GPU is being asked to process
in fact one of the more common gripes from folks who bought the RTX 3070 on
upper tier GPU was that it only came with eight gigabytes of vram resulting
in performance issues and graphical glitches and games the GPU itself could
probably have handled enter gddr7 which is expected to bring us a huge bump in
memory bandwidth without sucking down more power which is great news for those
who just want to turn up the settings but are already fighting the rising
power draws of neurogen graphics cards we're talking 36 gigabits per second per
pin once you translate this into a card with a 256-bit wide memory bus that is a
full 1.15 terabytes per second of
throughput to put that into perspective the RTX 4080 only has around 700
gigabytes per second of every bandwidth so all that extra space in the pipe
could help demanding titles even without adding more actual vram but what exactly
is the secret sauce that allows gddr7 to reach these new heights we'll tell you
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uses a little trick called Pam three and that's not the stuff you spray on your
pan so the tater tots don't stick it's pulse amplitude modulation in Pam 3 each
clock cycle can have three voltage States positive one negative one or zero
each sequence of two cycles encodes three bits of data for example of
negative one followed by a positive one corresponds to the bits 0 1 0. in this
way each clock cycle encodes 1.5 bits of
data instead of just a single bit but you're a Savvy viewer and maybe you
already know that the current top end video memory gddr6x actually supports
pam4 I mean isn't that better four is a
bigger number than three I think maybe well it's only better to a point Pam 4's
encoding scheme actually delivers two bits per cycle making it faster than Pam
3 on paper but there are some drawbacks four possible States per cycle means
that there's a greater chance for errors in data transmission and to compensate
for this you need more error correction functionality as well as a new physics
physical design and different memory controllers all of these things increase
both the cost and the power consumption not to mention that the gddr6x can only
operate in pan4 mode when data is being sent in eight byte bursts instead of the
more standard 16 bytes meaning gdpr6x can actually have less bandwidth overall
in real world scenarios put all this together and gddr7 is supposed to give
us more bandwidth while being more energy efficient than gdr6x not to
mention it can switch off Pam 3 when it's not needed and instead use the one
bit per cycle nrz scheme but what are we actually going to see in our graphics
cards the answer is probably late 2024 as that's when we're due for another
major GPU refresh from both AMD and NVIDIA and reports are already out that
NVIDIA may be planning to use gddr7 for its upcoming RTX 5000 GPU series which I
will definitely be buying as long as I can sell a couple of my organs first
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