memory bandwidth What is memory bandwidth on gpu

[XandersWithS]

RTX 2060 says 14000MHz is most effective, but at me its only 7000MHz

[Tan3l6]

  

Just now, XandersWithS said:

RTX 2060 says 14000MHz is most effective, but at me its only 7000MHz

 

 

DDR

 

Double data rate, not East Germany that pops up in google first.

[XandersWithS]

1 minute ago, Tan3l6 said:

  

 

 

DDR

 

Double data rate, not East Germany that pops up in google first.

What is that mean? Kinda confused

[3 Lions]

GDDR6 (Double Data Rate) 

 

7000 x 2= 14,000

[PopsicleHustler]

8 minutes ago, Tan3l6 said:

  

 

 

not East Germany that pops up in google first.

Depends on your location I guess 

[Tan3l6]

Just now, XandersWithS said:

What is that mean? Kinda confused

It makes two ticks in one cycle - 100Mhz ~ 200Mhz DDR

At least thats how I understand the ticks.

[XandersWithS]

1 minute ago, LinusTechTipsFanFromDarlo said:

GDDR6 (Double Data Rate) 

 

7000 x 2= 14,000

Btw i want to ask. Is rtx 2060 bottleneck with ryzen 5 2600?

[3 Lions]

2 minutes ago, XandersWithS said:

What is that mean? Kinda confused

https://en.wikipedia.org/wiki/Double_data_rate

[3 Lions]

Just now, XandersWithS said:

Btw i want to ask. Is rtx 2060 bottleneck with ryzen 5 2600?

No

[XandersWithS]

My cpu stuck at 3.6GHz. I don't know why gaming feels laggy

[mariushm]

Memory bandwidth on GPU is how fast is the highway between the video card memory (on the video card) and the gpu chip (the processor on the video card).

It has nothing to do with the rest of your computer.

 

It's also different from the pci-e bandwidth, which is equal to number of pci-e lanes x the speed of each lane (~1950MB/s for pci-e 4.0, 970MB/s for pci-e 3.0, or 500 MB/s for pci-e 2.0). This just means how fast data is copied from computer RAM into the video card memory on the video card.

 

GDDR5 and higher memory, transfers 4 bits of information with every tick (every Hz), on each data pin. You have 64-256 data pins (the bus value, 64 bit, 128 bit, 192 bit, 256 bit are common values)

 

Because of this, when the memory in reality is running at let's say 1500 Mhz , it's advertised as 4 x 1600 = 6000 Mhz

 

For example, a 256 bit GDDR5 or GDDR6 video card will use 8 memory chips, each 32 bit wide, and each of those data pins (8 x 32 pins) it will put 4 bits of information with every tick (Hz). So the maximum transfer speed from video card ram to processor is: 

 

8 chips x 32bits wide per chip x 4 bits per Hz x  1.500.0000  = 1,536,000,000 bits per second / 8 = 192,000,000 bytes/s = 192 GB/s of bandwidth.

 

The actual transfer speed between memory chips and gpu chip will depend on the size of the actual content that needs to be read.

 

You can compute the same for your computer ram, but with the mention that DDR3 and DDR4 only puts 2 bits on each data pin with every tick, and that each memory stick is 64 bit wide instead of 32.

So, if you have 2 sticks running at 3200 Mhz (real speed 1600 Mhz) in dual channel mode ( 2 x 64 bit sticks = 128 bit) your maximum ram speed is :

 

2 sticks x 64 bit x 2 bits per Hz x 1 600 000 = 409,600,000 bits per second /8 = 51,200,000  bytes/s = ~ 51 GB/s

 

 

[Mister Woof]

27 minutes ago, XandersWithS said:

Btw i want to ask. Is rtx 2060 bottleneck with ryzen 5 2600?

Yes.

 

No.

 

Sometimes.

[XandersWithS]

2 hours ago, Plutosaurus said:

Yes.

 

No.

 

Sometimes.

It depends on games or things you do right? I think i need to upgrade my ram speed to 3200MHz

[XandersWithS]

2 hours ago, mariushm said:

Memory bandwidth on GPU is how fast is the highway between the video card memory (on the video card) and the gpu chip (the processor on the video card).

It has nothing to do with the rest of your computer.

 

It's also different from the pci-e bandwidth, which is equal to number of pci-e lanes x the speed of each lane (~1950MB/s for pci-e 4.0, 970MB/s for pci-e 3.0, or 500 MB/s for pci-e 2.0). This just means how fast data is copied from computer RAM into the video card memory on the video card.

 

GDDR5 and higher memory, transfers 4 bits of information with every tick (every Hz), on each data pin. You have 64-256 data pins (the bus value, 64 bit, 128 bit, 192 bit, 256 bit are common values)

 

Because of this, when the memory in reality is running at let's say 1500 Mhz , it's advertised as 4 x 1600 = 6000 Mhz

 

For example, a 256 bit GDDR5 or GDDR6 video card will use 8 memory chips, each 32 bit wide, and each of those data pins (8 x 32 pins) it will put 4 bits of information with every tick (Hz). So the maximum transfer speed from video card ram to processor is: 

 

8 chips x 32bits wide per chip x 4 bits per Hz x  1.500.0000  = 1,536,000,000 bits per second / 8 = 192,000,000 bytes/s = 192 GB/s of bandwidth.

 

The actual transfer speed between memory chips and gpu chip will depend on the size of the actual content that needs to be read.

 

You can compute the same for your computer ram, but with the mention that DDR3 and DDR4 only puts 2 bits on each data pin with every tick, and that each memory stick is 64 bit wide instead of 32.

So, if you have 2 sticks running at 3200 Mhz (real speed 1600 Mhz) in dual channel mode ( 2 x 64 bit sticks = 128 bit) your maximum ram speed is :

 

2 sticks x 64 bit x 2 bits per Hz x 1 600 000 = 409,600,000 bits per second /8 = 51,200,000  bytes/s = ~ 51 GB/s

 

 

So speed of ram can affect some performance too, right? Mine 2666mhz rn

[Mister Woof]

1 minute ago, XandersWithS said:

It depends on games or things you do right? I think i need to upgrade my ram speed to 3200MHz

Some games that aren't very multithreaded and/or rely on a single network thread yes

 

Games like Doom or that are very well optimized, no

 

Games like ac:od that need threads yes, but not as bad as an Intel without it and lower core counts

[XandersWithS]

27 minutes ago, Plutosaurus said:

Some games that aren't very multithreaded and/or rely on a single network thread yes

 

Games like Doom or that are very well optimized, no

 

Games like ac:od that need threads yes, but not as bad as an Intel without it and lower core counts

Is it my current setup better if i use it for productivity or creator?