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RAM: Speed vs Latency

Hi,

 

I know this might be repeated topic, but I read so much and watch youtube videos and its getting more confusing due to different results I see from these benchmarks.

 

My Rig:

i7 9700KF @5.00Ghz @1.3v

Asus Z390m Prime

2x8GB DDR4 HyperX Predator OC to 3400mhz @1.35v, CL 16,18,18, 38

RTX 2080 Super

2560x1440 Monitor

 

Some say that CL is more important, other RAM speed, some say that for intel 3000mhz is enough, others say intel CPU wont run RAM more than 2666mhz as advertised on their website.!!!

 

 

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1. both matter, some workloads prefer bandwidth over latency and others prefer latency over bandwidth. but both are important, for example, a 3200 cl16 kit performs about the same when it comes to latency as a 3600 cl18 kit. 

1 hour ago, KhaderKh said:

others say intel CPU wont run RAM more than 2666mhz as advertised on their website.!!!

That's just wrong, 2666 is the base speed for the imc, meaning that anything over that is an overclock to the imc and is techincally not guaranteed, but assuming you are using a Z series board (which you are) you can run higher speeds.  

PC: Motherboard: ASUS B550M TUF-Plus, CPU: Ryzen 3 3100, CPU Cooler: Arctic Freezer 34, GPU: GIGABYTE WindForce GTX1650S, RAM: HyperX Fury RGB 2x8GB 3200 CL16, Case, CoolerMaster MB311L ARGB, Boot Drive: 250GB MX500, Game Drive: WD Blue 1TB 7200RPM HDD.

 

Peripherals: GK61 (Optical Gateron Red) with Mistel White/Orange keycaps, Logitech G102 (Purple), BitWit Ensemble Grey Deskpad. 

 

Audio: Logitech G432, Moondrop Starfield, Mic: Razer Siren Mini (White).

 

Phone: Pixel 3a (Purple-ish).

 

Build Log: 

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You got fast ram already, just run it as such and don't worry about it. Most things are not very ram bandwidth limited so only see modest changes in performance with faster ram. 

 

Different workloads scale differently with speed and/or latency. Speed will also affect latency. Generally I'd go for the fastest without paying silly money for it, with timings a very much secondary consideration. Around 3000 is great for a value build, above that is better but not essential.

 

On Intel side, there is some complication with compatibility. Generally you can't run ram above the CPU's supported speed without a Z chipset. AMD systems have different considerations which impact ram choice, if you really want to squeeze more performance out of it.

TV Gaming system: Asus B560M-A, i7-11700k, Scythe Fuma 2, Corsair Vengeance Pro RGB 3200@2133 4x16GB, MSI 3070 Gaming Trio X, EVGA Supernova G2L 850W, Anidees Ai Crystal, Samsung 980 Pro 2TB, LG OLED55B9PLA 4k120 G-Sync Compatible
Streaming system: Asus X299 TUF mark 2, i9-7920X, Noctua D15, Corsair Vengeance LPX RGB 3000 8x8GB, Gigabyte 2070, Corsair HX1000i, GameMax Abyss, Samsung 970 Evo 500GB, Crucial BX500 1TB, BenQ XL2411 1080p144 + HP LP2475w 1200p60
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4 minutes ago, KhaderKh said:

Hi,

 

I know this might be repeated topic, but I read so much and watch youtube videos and its getting more confusing due to different results I see from these benchmarks.

 

My Rig:

i7 9700KF @5.00Ghz @1.3v

Asus Z390m Prime

2x8GB DDR4 HyperX Predator OC to 3400mhz @1.35v, CL 16,18,18, 38

RTX 2080 Super

2560x1440 Monitor

 

Some say that CL is more important, other RAM speed, some say that for intel 3000mhz is enough, others say intel CPU wont run RAM more than 2666mhz as advertised on their website.!!!

 

 

The deal is different editions of different CPUs are more or less able to take advantage of ram speed increases. As a result for some intel versions (8th gen and below?) there isn’t a good reason to pay more money for faster ram because not much benefit can be gained. Faster ram costs more money, so it can become a false economy.  Faster ram is still faster, so one of these CPUs that uses it less efficiently would still get faster of memory was all the same price, but currently it’s not.  If some day the only ddr4 is 4000mhz for example (something I expect to eventually come to pass) a chip that doesn’t use faster memory well can still use it fine.

Life is like a bowl of chocolates: there are all these little crinkly paper cups everywhere.

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6 minutes ago, KhaderKh said:

Some say that CL is more important, other RAM speed, some say that for intel 3000mhz is enough, others say intel CPU wont run RAM more than 2666mhz as advertised on their website.!!!

Ryzen tends to benefit more from lower latency, Intel tends to benefit more from higher frequency, but ultimately it's a balancing act regardless of platform.

 

I don't see anything to worry about in your case - 3400 CL16 is fast enough that you won't see a notable benefit in terms of performance with a faster memory kit in most real-world workloads.

 

2666MHz is what the IMC on your 9700KF is rated for. Anything over that is considered an overclock, and not necessarily guaranteed to be obtainable (but for a Coffee Lake IMC to not handle anything more than 2666MHz, it must be seriously borked).

Desktop: Intel Core i9-9900K | ASUS Strix Z390-F | G.Skill Trident Z Neo 2x16GB 3200MHz CL14 | EVGA GeForce RTX 2070 SUPER XC Ultra | Corsair RM650x | Fractal Design Define R6

Laptop: 2018 Apple MacBook Pro 13"  --  i5-8259U | 8GB LPDDR3 | 512GB NVMe

Peripherals: Leopold FC660C w/ Topre Silent 45g | Logitech MX Master 3 & Razer Basilisk X HyperSpeed | HIFIMAN HE400se & iFi ZEN DAC | Audio-Technica AT2020USB+

Display: Gigabyte G34WQC

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