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AMD Bulldozer FX 1866MHz+ - Page 2

post #11 of 32
Thread Starter 
I'm doing all of this specially because a good friend of mine building a new PC
and as for now that's his specs:
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post #12 of 32
Once again more posts removed than actual posts that are on topic. Seriously this getting ridiculous. Stay on topic and only post if you have something positive to add
post #13 of 32
wow..3 pages of posts removed..hey..i was reading that
 
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post #14 of 32
Quote:
Originally Posted by Malcom28 View Post
yea..but if you read my post at the first page..the post that this thread about..you can understand what i'm talking about..


FX 8150+2133MHz vs i7 2600k+1600MHz

nobody review'd that way

Well, both memory controllers have the same maximum memory bandwidth 21 GB/s, so, you should use the same memory standard when comparing CPUs.

So pair both CPUs with 2133mhz memory and re-test??

Oh wait... You'd rather handicap the Intel chip as much as you can in order to skew the results as much as possible.

You must be an AMD marketing guru!!
 
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post #15 of 32
Thread Starter 
Quote:
Originally Posted by nakano2k1 View Post
Well, both memory controllers have the same maximum memory bandwidth 21 GB/s, so, you should use the same memory standard when comparing CPUs.

So pair both CPUs with 2133mhz memory and re-test??

Oh wait... You'd rather handicap the Intel chip as much as you can in order to skew the results as much as possible.

You must be an AMD marketing guru!!
yea..but you can put 2400MHz memory on Bulldozer FX and even make it 2667MHz.

AMD marketing sucks... instead of tell ppl how to be ready to fx cpu tell that HD6850 or higher is need'ed they should have tell that 1866MHz or higher that's what really is need'ed
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post #16 of 32
You removed my last post which was completely on topic.

Anyway, memory simply doesn't influence performance all that much in the overwhelming majority of situations. Even if it did, the performance difference between 1600 and 1866 is completely trivial.

You would be hard pressed to see the difference between 1066 and 2133 in practical situations. Bulldozer didn't change this. There is no evidence of some magically arbitrary cut off for DDR3-1866.

Yes, you will likely be able to measure a minuscule improvement in performance with faster memory, but you would be way better off just getting DDR3-1600 and spending the rest elsewhere.

Quote:
Originally Posted by nakano2k1 View Post
Well, both memory controllers have the same maximum memory bandwidth 21 GB/s
No they don't. Not in any practical scenario.

Quote:
Originally Posted by Malcom28 View Post
yea..but you can put 2400MHz memory on Bulldozer FX and even make it 2667MHz.
2400 isn't JEDEC certified yet, has just shown up, and costs a fortune.

Quote:
Originally Posted by Malcom28 View Post
they should have tell that 1866MHz or higher that's what really is need'ed
It's not even remotely needed.
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post #17 of 32
Quote:
Originally Posted by Blameless View Post
No they don't. Not in any practical scenario.
Care to elaborate??
 
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post #18 of 32
Seeing as calling out Wiki for having incorrect specs is "not positive" or "on topic"...I'll just place Malcom28 in the old ignore list.
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post #19 of 32
Quote:
Originally Posted by nakano2k1 View Post
Care to elaborate??
~21GB/s is the purely theoretical performance of dual-channel DDR3-1333.

In reality no system running dual DDR3-1333 will ever reach that number. Also, how close they get is dependent more on the IMC than anything.

Even if BDs IMC is as efficient as Sandy's per clock (an uncertain assumption). Bulldozer's memory performance is more limited than SB because BD has a vastly lower clocked IMC (which is part of the CPU-NB). Bulldozer's CPU-NB is 2GHz stock, and is limited to about 2.6GHz on air cooling, while Sandy's always runs at full CPU speed.

In the real world, assuming memory at identical clocks and timings Bulldozer has vastly less memory bandwidth than Sandy Bridge. Even with faster memory, this changes little.

Still, BD does seem to have a better IMC than Deneb/Thuban, and competes fairly well with the first gen i5s/7s, in this respect.
Edited by Blameless - 10/17/11 at 7:58am
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post #20 of 32
Quote:
Originally Posted by Blameless View Post
~21GB/s is the purely theoretical performance of dual-channel DDR3-1333.

In reality no system running dual DDR3-1333 will ever reach that number. Also, how close they get is dependent more on the IMC than anything.

Even if BDs IMC is as efficient as Sandy's per clock (an uncertain assumption). Bulldozer's memory performance is more limited than SB because BD has a vastly lower clocked IMC (which is part of the CPU-NB). Bulldozer's CPU-NB is 2GHz stock, and is limited to about 2.6GHz on air cooling, while Sandy's always runs at full CPU speed.

In the real world, assuming memory at identical clocks and timings Bulldozer has vastly less memory bandwidth than Sandy Bridge. Even with faster memory, this changes little.

Still, BD does seem to have a better IMC than Deneb/Thuban, and competes fairly well with the first gen i5s/7s, in this respect.
21GB/s is the speed of 1600mhz memory.

I realize that by overclocking the memory controller on die that you can use the higher bandwidth memory. Intel's architecture is so much more advanced given the 256 bit/cycle ring bus that implements all the controllers for lower latencies all around. This is why the memory controller runs more efficiently than the AMD.

The general architecture of BD looks superior to it's Phenom counterpart, but that's about where it seems to end though. IPC is still a major issue it seems.
 
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Sandisk Plus 256gb Toshiba 7200rpm 2tb Toshiba 7200rpm 2tb Deepcool Gamaxx 400 
OSMonitorKeyboardPower
Windows 10 64bit ASUS Designo MX299Q Logitech K800 EVGA Supernova 750w G2 
CaseMouseMouse Pad
Corsair 270R Logitech performance mouse MX Steelseries QcK 
CPUMotherboardGraphicsRAM
i5-4200u Haswell ULT NVidia GT 750m 12gb DDR3L 1600mhz 
Hard DriveOSMonitorAudio
32gb SSD + 1tb HDD Windows 10 64-bit 14" Glossy AHVA 1080p Touchscreen Realtek HD 
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Acer V7-482PG
(8 items)
 
 
CPUMotherboardGraphicsRAM
Ryzen 5 1400 4.0ghz @1.33V GIGABYTE GA-AB350-Gaming EVGA GeForce GTX 780 Ti Dual Classified w/ EVGA... Mushkin Redline DDR4 3200mhz 16gb (8gb x 2) 
Hard DriveHard DriveHard DriveCooling
Sandisk Plus 256gb Toshiba 7200rpm 2tb Toshiba 7200rpm 2tb Deepcool Gamaxx 400 
OSMonitorKeyboardPower
Windows 10 64bit ASUS Designo MX299Q Logitech K800 EVGA Supernova 750w G2 
CaseMouseMouse Pad
Corsair 270R Logitech performance mouse MX Steelseries QcK 
CPUMotherboardGraphicsRAM
i5-4200u Haswell ULT NVidia GT 750m 12gb DDR3L 1600mhz 
Hard DriveOSMonitorAudio
32gb SSD + 1tb HDD Windows 10 64-bit 14" Glossy AHVA 1080p Touchscreen Realtek HD 
  hide details  
Reply
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