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G.Skill Brought Its Blazing Fast DDR4-4800 To Computex

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the nerd 389

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It's too bad that Intel's new X-series uses thermal paste as the TIM. It really puts a damper on overclocking.

On the S-series, you could get a few CPUs and take the risk of replacing the TIM. That's a lot less likely when the CPU costs $1000 (for the i9-7900X) to start with, and uses a much larger die.

Still, it's good to know you can push RAM to DDR4-4800, even if the i9-7900X only goes to 4500 MHz on a good day.
 

RomeoReject

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Everything I've read says that the new AMD stuff does better with fast memory. Would something like this help them even more? Or do we hit a certain point where added speed becomes pointless?
 

JimmiG

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The highest speed divider that you can dial in on Ryzen is 4000 MHz, with AGESA 1.0.0.6. However I don't think anyone has achieved 4000 MHz with any stability.

With the highest quality RAM modules and the most expensive motherboards, it seems 3466 MHz is about the limit of what you can achieve without encountering memory errors and stability issues. A small number of users might have achieved 3600 MHz, though I have to wonder whether that's completely stable running 24/7 stress tests (memory errors can take many hours of stress testing to manifest themselves).

There are diminishing returns above 3200 MHz anyway so the sweet spot for Ryzen is still a good set of 3200 C14 sticks.
 
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That was mostly true with the chips that had integrated graphics. However, it's not really that true with this generation.

IMO, a big problem are that the JEDEC standards, and the industry in general, had no idea the MT/s would increase so fast. With DDR3, the stardard went from 800 to 2133 MT/s, over a 10 year period. With DDR4, the stardard goes from 2133 MT/s to 3200 MT/s. Well, about 2-3 years in, we are already at 4800 MT/s speeds.

We are outside of standards and outside of specs. It's a wonder it works at all. I expect it will be a really bad situation in a couple years, for several reasons.
 

jasonelmore

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@andy chow, that's where your wrong. Ryzen's cache and CCX fabric benefit greatly from fast memory.. it's what determines how fast the two CCX's communicate with each other.
 
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Really? Have any proof? I've read that, but doubt it. Show me actual benchmarks in real world scenarios (I consider compiling real-world), and I'll believe it.
 

the nerd 389

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See:
http://www.tomshardware.com/reviews/overclocking-amd-ryzen,5011-7.html
http://www.tomshardware.com/reviews/amd-ryzen-5-1500x-cpu,5025-2.html
http://www.guru3d.com/articles_pages/amd_ryzen_7_memory_and_tweaking_analysis_review,1.html

The TH reviews don't explicitly cover application performance in the memory sections, but the guru3D article is quite thorough. If you need more, I'd be happy to oblige. Not many reviewers cover compiling, so you'll have to make do with the more standard benchmarks, such as compression. Compression serves as a decent gauge of performance across a number of workloads.

It's also worth mentioning that compilers are updated so frequently that it's difficult to use them as a benchmarking tool. I'm sure you've seen a number of sites try to do so, but they normally give up pretty quickly. You'll have to find another application to serve as your go-to for benchmarking.
 
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Your links mostly confirmed my suspicions. Between 2133 and 3200 ram, you have a 3% increase in performance. and that's pure compression, which is valid, but artificial at the same time (the same algorithm over and over with no heterogeneity).

Compiling is a very valid and standard benchmark. Phoronix has been running them for years, a decade a least. Comparing multi-platform benchmarks for compilations of various software, with various GCC and clang versions, is an industry standard and very common. Some of us work for a living, it's not niche.

If you pay a QMO guy 85k a year, and he can run 3 or 4 tests a day, then that's a benchmark which is very important.
 

the nerd 389

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It's true that if you have the time to rerun benchmarks with each update, compiling is the best way to gauge performance in compiling workloads (naturally). Unfortunately, very few people outside of the IT industry have time to parse through 3 or 4 tests per day, and it's practically impossible to write articles at that rate. The impracticality of using compilers as a general purpose benchmark should be self-evident from your response.

If that's all you're paid to do, and it's the only software you'll ever use, that's one thing. For those of us that work in other areas, it's not an option. The funny part is that using information in general reviews can give estimates that are very close to the accuracy of actual workload-specific testing if you do your homework.

Lastly, improving the inter-CCX latency isn't going to give you dramatic gains like a clock speed boost would. 3% is quite significant as far as that factor is concerned. After all, there were times when that was the performance difference between consecutive generations of Intel CPUs. Will it change how you work? Probably not. Will it be noticeable in heavy workloads? Definitely.
 
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