ASRock 890FX Deluxe: Comprehensive Motherboard Review & Investigation of Thuban Performance Scaling
by Rajinder Gill on August 31, 2010 7:00 AM EST- Posted in
- ASRock
- AMD
- Motherboards
- 890FX
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Testbed Setup Overclocking / Benchmark Testbed |
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| Processors | Phenom II X6 1090T 3.2GHz 6MB L3 Cache |
| CPU Voltage | Various |
| Cooling | Scythe Mugen II |
| Power Supply | Corsair HX620W |
| Memory | CorsairXMS3 CM4GX3M2A1600C7 2x2GB Kit |
| Memory Settings | Various |
| Video Cards | Radeon HD5870 |
| Video Drivers | Catalyst 10.7 |
| Hard Drive | OCZ Vertex 120GB SSD |
| Optical Drives | Plextor PX-B900A, Toshiba SD-H802A |
| Case | Open Test Bed |
| Operating System | Windows 7 64 bit |
| . | |
We are splitting today’s test into two parts. In part one; we take a look at the impact of Thuban’s CPU-NB (or IMC, integrated Memory Controller) on performance, courtesy of our retail 1090T and the ASRock 890FX Deluxe 4. In part two we’re pitting the ASRock 890FX Deluxe 4 against ASUS’ M4A89GTD Pro/USB3 through our usual but slightly revised and condensed benchmark suit.
For the latter, we would like to ask readers ahead for an understanding that this is our first evaluation of the 890FX-based board and we are in the middle of devising a proper testing suit for this platform. Once we have more experience with products based on this chipset, we will have a thorough comparison of power consumption and onboard controllers, including multi-GPU performance.
To make up for this deficit, we decided to spend some time on investigating the new CPU-NB of Thuban. It is a well-known secret that Phenom architecture benefits from faster CPU-NB. The bottlenecks are manifold, but we hypothesize a few.
- The CPU-NB’s frequency is directly responsible for the transaction of data between CPU and memory. Lower CPU-NB frequency thus tends to waste memory bandwidth.
- The CPU-NB’s frequency is also the CPU’s L3 cache frequency. Even when memory access doesn’t come into equation, slow L3 impacts the overall CPU performance.
- The CPU-NB is what controls the memory (it’s another name is “IMC” after all). A higher quality IMC tends to be more flexible when it comes to DIMM frequency and timings. Whether overclocked or not, previous generation Phenoms didn’t like high speed memory, even though the same modules were perfectly able on Intel platforms.
Assuming the above, it is easy to imagine the performance impact CPU-NB plays on this architecture. Any of the above can present a performance bottleneck. Prior to E0 revision silicon (Thuban is E0 stepping), Phenom II’s CPU-NB’s quality was frankly abysmal, and outside extreme conditions (i.e. sub-zero) there just wasn’t enough room to improve performance by manipulating CPU-NB.
However, we now see a dramatically different characteristic of the CPU-NB in E0 silicon Thuban CPUs. Previously unthinkable frequencies under air-cooling are now a possibility, and it handles high frequency DIMMs much better as well. So we think it is a perfect time to start examining the impact of the CPU-NB in AMD’s “Star” architecture.
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Kane Y. Jeong - Wednesday, September 1, 2010 - link
We disabled Turbo Core for maximum overclocking. vCore was measured by a DMM.softdrinkviking - Wednesday, September 1, 2010 - link
nice review, good read.one thing I noticed, in your chart comparing the 890FX and 790FX, it says "TMSC 65nm," i am thinking that should be "TMSC 45nm."
or maybe i'm crazy, or maybe both are true?
softdrinkviking - Wednesday, September 1, 2010 - link
or is that the AMD890 chipset manufacturing process that's at 65nm?pkc - Wednesday, September 1, 2010 - link
I believe that it should be compared with ASUS M4A89TD Pro/USB3 and Gigabyte GA-890FXA-UD5 which are using the same chipset i.e. 890FXMacLeod1592 - Wednesday, September 1, 2010 - link
I currently run an ASRock 780G motherboard and was hoping theyd stepped it up a notch. My board also overvolts the CPU when I overclock. Its always a notch or two higher in CPU-Z than what I set it to in the BIOS.Mines also not a great overclocker. I cant get my Athlon X3 435 over 3.4 but all the reviews Im seeing have it at 3.6 and better!
Looks like Asus will be getting my money in the near future when I upgrade mobos.
siniranji - Thursday, September 2, 2010 - link
my question is , which thuban processor will perform well with this board, i have 1055T modelMrSpadge - Saturday, September 4, 2010 - link
Can I comment now?MrSpadge - Saturday, September 4, 2010 - link
Ups, that was unexpected. On to my actual comment regarding:"We have no conclusive theory to explain this phenomenon at this time. Originally our suspicion was limited to CPU-NB’s frequencies and memory frequencies/timings, but now we wonder whether the size of L3, which is meager 1MB per core for the X6’s, comes into play as well. We are looking to further examine this subject in the future."
Naturally modern games have very complex scenes so the CPU has to deal with a lot of data. Which data is not entirely predictable & prefetchable, so the CPU absolutely needs large caches. In fact, the caches can hardly be large enough - so main memory bandwidth and latency matters.
The encoding on all 6 cores on the other hand is a very regular task and the memory requests are quite predictable. The programmer or and / the cpu prefetchers are working to keep all the data in the caches before they are needed.
Or put empirically: If the app is programmed so well that it scales well from 4 to 6 cores [your encoding does], memory access can not be a problem here. And thus faster memory doesn't help much.
Regards, MrS
geok1ng - Monday, September 6, 2010 - link
There we have it again, a seminal article that will be quoted around the web for months to come.This easy to read article is the most complete and compreensive guide to AM3 plataform overcloking, and deserves to join the now famous "why we were wrong about the P45 chipset" article on C2D memory overcloking and the SSDs series.
To give you guys an example of the importance of NB overcloking on these AMDs hexacores, Tom Hardware´s has an article on the system builders marathon today that shows a 1055T system with SLI 480s. Th build fails to impress by about 20% agains a similar priced $2000 Intel system, and guess what? TH makes no mention of NB overclock!
RealTheXev - Friday, September 10, 2010 - link
I've run into several people who have had a 8xx series AMD chipset but have run into an issue of having an SB750 southbridge instead of the SB850.http://www.starcraft2forum.org/forums/showthread.p... for my write up.
My question is, will Asus be addressing this issue by adding the SB750 to their chipset drivers? Also, will this board possible be substituted for an SB750 southbridge as well? If so, I want to know the performance difference!
Asus isn't the only manufacture substituting the southbridge. I'm curious about the difference between the SB850 and SB750 variants of these boards and how likely it is a user will end up with one of these boards "substituted" boards.