Ram Speed

[Mpire934]

What O.C numbers can the ASUS ROG CROSSHAIR VIII HERO push the ram to

I plan on getting 3600mhz

[Moonzy]

 

though you'll probably be limited by your CPU's IMC before you get anywhere near those speeds, and ryzen FCLK should stay on 1:1 for better latency

[Mpire934]

1 minute ago, Moonzy said:

 

though you'll probably be limited by your CPU's IMC before you get anywhere near those speeds, and ryzen FCLK should stay on 1:1 for better latency

so a Ryzen 7 3700x won't run the speed very well?

[Moonzy]

3 minutes ago, Mpire934 said:

so a Ryzen 7 3700x won't run the speed very well?

most Zen 2 CPU runs 3600MHz on single rank just fine, though it's only officially supported up to 3200MHz. I've seen some chips not being able to go above 3200MHz, albeit quite rare.

 

it's up to luck, but 3600MHz with 1800 FCLK should be achievable in most zen 2 CPUs.

 

expect to lose frequency as memory rank goes up (more sticks/capacity in each slot)

 

AMD stated that 3900x only support up to 2666 on quad rank 128gb configs. read it in a reddit post

[Mpire934]

1 minute ago, Moonzy said:

most Zen 2 CPU runs 3600MHz on single rank just fine, though it's only officially supported up to 3200MHz. I've seen some chips not being able to go above 3200MHz, albeit quite rare.

 

it's up to luck, but 3600MHz with 1800 FCLK should be achievable in most zen 2 CPUs.

 

expect to lose frequency as memory rank goes up (more sticks/capacity in each slot)

So go Ryzen 7 3700x

with 3200mhz cl16 Ram

[Moonzy]

2 minutes ago, Mpire934 said:

So go Ryzen 7 3700x

with 3200mhz cl16 Ram

yea would be fine for gaming

 

you could consider 3600 CL16 ram if they're not much more expensive

or 3600 CL18 RAM if you're doing bandwidth intensive tasks (games arent bandwidth intensive)

 

3200 C16 ~= 3600 C18 in term of latency

[nick name]

4 minutes ago, Mpire934 said:

So go Ryzen 7 3700x

with 3200mhz cl16 Ram

I wouldn't worry about going with 3600MHz.  You're not gonna have any trouble with that in terms of FCLK. 

 

A crappy mobo and RAM kit might not play well though, but I wanna say I really only saw that problem with ASUS TUF and 3600 16-19-19 RAM kits.  

[Mpire934]

1 minute ago, Moonzy said:

yea would be fine for gaming

 

you could consider 3600 CL16 ram if they're not much more expensive

or 3600 CL18 RAM if you're doing bandwidth intensive tasks (games arent bandwidth intensive)

 

3200 C16 ~= 3600 C18 in term of latency

Gaming is my main priority with my pc so i will go with 3200mhz Cl16 

my Budget is eaten by the ROG 3080 OC

[nick name]

3 minutes ago, Moonzy said:

yea would be fine for gaming

 

you could consider 3600 CL16 ram if they're not much more expensive

or 3600 CL18 RAM if you're doing bandwidth intensive tasks (games arent bandwidth intensive)

 

-snip-

Are you trying to say that CL18 has higher bandwidth than CL16?  Because that's how that came across.  

[nick name]

1 minute ago, Mpire934 said:

Gaming is my main priority with my pc so i will go with 3200mhz Cl16 

my Budget is eaten by the ROG 3080 OC

What's your budget for RAM?

[Moonzy]

1 minute ago, nick name said:

Are you trying to say that CL18 has higher bandwidth than CL16?  Because that's how that came across.  

3600 vs 3200 that he showed

 

should've made it clearer

[Mpire934]

1 minute ago, nick name said:

What's your budget for RAM?

200 USD

[nick name]

Just now, Moonzy said:

3600 vs 3200 that he showed

 

should've made it clearer

So then you know 3600C16 is better than 3600C18 in terms of bandwidth right?

[nick name]

Just now, Mpire934 said:

200 USD

How much RAM?  

[Moonzy]

Just now, nick name said:

So then you know 3600C16 is better than 3600C18 in terms of bandwidth right?

hmm, care to educate me? (not sarcasm, genuinely wanting to learn)

 

i just know bandwidth = MT/s x 8bytes x efficiency

lower CL = higher efficiency i assume, though by how much?

is it as much diff as 3200 vs 3600? (around 13% diff i think)

[nick name]

2 minutes ago, Moonzy said:

hmm, care to educate me? (not sarcasm, genuinely wanting to learn)

 

i just know bandwidth = MT/s x 8bytes x efficiency

lower CL = higher efficiency i assume, though by how much?

is it as much diff as 3200 vs 3600? (around 13% diff i think)

Well I don't know about the formula you're using to figure out the theoretical bandwidth, but I can tell you that lower CL will result in higher bandwidth.  

 

And if comparing kits with matching latencies then you always want to go with the faster kit as it will have higher bandwidth and also the other benefits it brings to Ryzen platforms.  

[nick name]

31 minutes ago, Mpire934 said:

200 USD

You can buy a very, very good 16GB kit for that price or a very good 32GB kit for $220.