B250H, RTX 3--- GPU

[Killarsquirl]

I have a 7700k in a b250h (I know why get a unlock CPU with a motherboard that can't overclock - my bad!) and I am looking at upgrading my GPU. I heard the 3070's are going for about 500 USD and would love to upgrade from my 1060 6gb. My question is will a 3070 work on a b250h mobo or should I get a 2070S or even 2080 depending on price reductions at release of the 3000's? TIA

 

Heres the url for 250h

https://www.asus.com/Motherboards/ROG-STRIX-B250H-GAMING/

[Bombastinator]

Pcie4 GPUs will work in pcie3. The only issue is if you already have a card in the board there may not be enough pcie lanes. B250h should still have 16xpcie3.0 in the main pcie slot. If you have another card in there as well (networking, etc..) it May cut to pcie3.0x8 + pcie3.0x8.  This isn’t a problem on lower power cards. But the 3070 is supposed to be 2080ti power level which means it will saturate more than 8 lanes of pciex3.0

[Fasauceome]

2 minutes ago, Bombastinator said:

If you have another card in there as well (networking, etc..) it May cut to pcie3.0x8 + pcie3.0x8

The chipset will supply PCIe lanes in that case, so the CPU has a full x16 to the GPU.

 

21 minutes ago, Killarsquirl said:

should I get a 2070S or even 2080 depending on price reductions at release of the 3000's

We will have to see. Price cuts will be more related to stock of the cards that needs to move, more so than the actual relative value/performance of the cards, so don't expect amazing deals or anything. It also depends on your performance target though 

[Bombastinator]

3 minutes ago, Fasauceome said:

The chipset will supply PCIe lanes in that case, so the CPU has a full x16 to the GPU.

 

We will have to see. Price cuts will be more related to stock of the cards that needs to move, more so than the actual relative value/performance of the cards, so don't expect amazing deals or anything. It also depends on your performance target though 

So that chip has 20 pcie lanes?  I thought one of the things wraith all intel chips is the consumer grade stuff only ever got 16 lanes total.  Or is it 16 + the chipset?

[Fasauceome]

11 minutes ago, Bombastinator said:

So that chip has 20 pcie lanes?  I thought one of the things wraith all intel chips is the consumer grade stuff only ever got 16 lanes total.  Or is it 16 + the chipset?

always 16 off the CPU + chipset. B250 gives 3.0 x12 per the spec sheet

https://ark.intel.com/content/www/us/en/ark/products/98086/intel-b250-chipset.html

doesn't take much to chuck a handful of lanes off the chipset anyway, although I believe some of the skylake boards had 2.0 on the low end.

 

also, block diagram just cuz

Edited September 2, 2020 by Fasauceome

[Bombastinator]

7 minutes ago, Fasauceome said:

always 16 off the CPU + chipset. B250 gives 3.0 x12 per the spec sheet

https://ark.intel.com/content/www/us/en/ark/products/98086/intel-b250-chipset.html

doesn't take much to chuck a handful of lanes off the chipset anyway, although I believe some of the skylake boards had 2.0 on the low end.

 

also, block diagram just cuz

So 16 pcie + DMI 3.0 whatever that is. AMD has 16 pcie + 4pcie to the chipset. 

[Fasauceome]

1 minute ago, Bombastinator said:

So 16 pcie + DMI 3.0 whatever that is. 

you can just treat DMI as the PCie lanes from the chipset, they're the same in this example.

[Bombastinator]

12 minutes ago, Fasauceome said:

you can just treat DMI as the PCie lanes from the chipset, they're the same in this example.

That is confusing.  DMI is “whatever spare pcie3 lanes the GPU isn’t using”?

 

bah. Looking up intel DMI 3.0

 

Ok. DMI 3.0 is a 4x link, but it’s is own proprietary thing that they measure as 8 GT/sec (which is apparently an “informal” (I.e. bs) measurement. So it’s 16 + 4 but the 4 is DMI. So basically b550, except the top slot gets 16 lanes of pcie3 instead of 16 lanes of pcie4, and the “up to 12” is really “up to 12 as long as the data fits in x4”