RAM OC to 4Ghz on i7 9700k

[Maverick262001]

Is it possible to use 4x8 RAM ...all memory chips running at 4000 Mhz on an i7 9700k system ?

[Jurrunio]

With utter garbage timings (and hence low performance) and a T-topology board like the Gigabyte Aorus Master, yes

[Maverick262001]

29 minutes ago, Jurrunio said:

With utter garbage timings (and hence low performance) and a T-topology board like the Gigabyte Aorus Master, yes

Didn't get you brother... could you say in a more simpler and elaborated way

[Jurrunio]

3 minutes ago, Maverick262001 said:

Didn't get you brother... could you say in a more simpler and elaborated way

it's possible but unrealistic and not profitable

[porina]

38 minutes ago, Jurrunio said:

With utter garbage timings (and hence low performance) and a T-topology board like the Gigabyte Aorus Master, yes

Many 4000 kits are CL19, which is equivalent in latency to 3200C15, so it's not actually bad, plus you get the benefit from both having dual rank per channel on top of the increased bandwidth. If you use a bandwidth sensitive application, it would help.

 

However, I'd hate to imagine the chances of success at running 4 modules at 4000. I've never tried but it does seem rather hit and miss if a particular board/CPU combo will go that high. So if you really need more ram bandwidth, X299 is the more obvious choice.

[Maverick262001]

3 minutes ago, porina said:

Many 4000 kits are CL19, which is equivalent in latency to 3200C15, so it's not actually bad, plus you get the benefit from both having dual rank per channel on top of the increased bandwidth. If you use a bandwidth sensitive application, it would help.

 

However, I'd hate to imagine the chances of success at running 4 modules at 4000. I've never tried but it does seem rather hit and miss if a particular board/CPU combo will go that high. So if you really need more ram bandwidth, X299 is the more obvious choice.

So how high I can go with four modules and same memory config ?(100% accuracy)(no hit or miss thing)

3000?

3200?

[porina]

1 minute ago, Maverick262001 said:

So how high I can go with four modules and same memory config ?(100% accuracy)(no hit or miss thing)

3000?

3200?

The problem is any speed above that supported by the CPU is a kinda overclock, even if the ram makers say they can do it. In my experience which doesn't go as far as 4000 (yet) some mobo/ram combos just don't like each other. There may be some CPU dependency too at the extreme end, not forgetting mobo bios also contributes. Also running 2 sticks per channel over 1 stick per channel will increase the loading. There's a load of variables.

 

The play it safe version would be to get 3200 Samsung B-die as that pretty much works with anything, and usually overclocks well above that. You'll probably be ok with any modern 3200 kit. By modern, let's say released since Coffee Lake as I've heard they altered some sub-timings to help compatibility compared to modules released for previous CPUs.

[Maverick262001]

1 minute ago, porina said:

The problem is any speed above that supported by the CPU is a kinda overclock, even if the ram makers say they can do it. In my experience which doesn't go as far as 4000 (yet) some mobo/ram combos just don't like each other. There may be some CPU dependency too at the extreme end, not forgetting mobo bios also contributes. Also running 2 sticks per channel over 1 stick per channel will increase the loading. There's a load of variables.

 

The play it safe version would be to get 3200 Samsung B-die as that pretty much works with anything, and usually overclocks well above that. You'll probably be ok with any modern 3200 kit. By modern, let's say released since Coffee Lake as I've heard they altered some sub-timings to help compatibility compared to modules released for previous CPUs.

Alright brother...thank you so much.. I'm gonna buy Corsair RGB ones (3200) kit

[Jurrunio]

15 minutes ago, porina said:

Many 4000 kits are CL19, which is equivalent in latency to 3200C15, so it's not actually bad, plus you get the benefit from both having dual rank per channel on top of the increased bandwidth. If you use a bandwidth sensitive application, it would help.

 

However, I'd hate to imagine the chances of success at running 4 modules at 4000. I've never tried but it does seem rather hit and miss if a particular board/CPU combo will go that high. So if you really need more ram bandwidth, X299 is the more obvious choice.

I didn't even consider 4000 CL19 as doable with 4 sticks, I'm thinking 4000 CL22

 

13 minutes ago, Maverick262001 said:

So how high I can go with four modules and same memory config ?(100% accuracy)(no hit or miss thing)

3000?

3200?

3600MHz probably. The best SPD that you can run with confidence will be 3466MHz CL16 or 3600MHz CL16.

[Maverick262001]

4 hours ago, Jurrunio said:

I didn't even consider 4000 CL19 as doable with 4 sticks, I'm thinking 4000 CL22

 

3600MHz probably. The best SPD that you can run with confidence will be 3466MHz CL16 or 3600MHz CL16.

So yeah Corsair vengeance pro RGB (3600Mhz) is the best option, right?

[Princess Luna]

7 minutes ago, Maverick262001 said:

So yeah Corsair vengeance pro RGB (3600Mhz) is the best option, right?

I personally like 3333/14

 

Can do with good 3200/14 kits and will be the sweet spot personally speaking, all in all it there's really so much you need to get your memory setting covered up, if you want 32gb of memory I strongly suggest using 2x16gb since you reduce points of failure in your system.

 

Cheers

[Jurrunio]

9 minutes ago, Maverick262001 said:

So yeah Corsair vengeance pro RGB (3600Mhz) is the best option, right?

Whatever vendor or model is not my focus, they are only different on the outsides anyway