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[TS] DDR3 vs. DDR4: Raw bandwidth by the numbers - Page 4

post #31 of 95
Quote:
Originally Posted by ZealotKi11er View Post

If only AMD APUs has that much memory bandwidth lol.
Yeah, kind of pathetic when Ivy Bridge E processors can deliver 3 times more read, 5 times more write bandwidth.
PS: I wonder why they withheld the old Ivy Bridge processors. Hmm...
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post #32 of 95
Quote:
Originally Posted by BiG StroOnZ View Post

"Note also that Haswell’s memory controller has a hard time going past 2400MHz, which really has been the performance sweet spot in DDR3."

Memory Controller can't handle it.

Haswell's memory controller has no problem doing 3000+... I have no idea where they got that idea. There are 381 memory submissions on HWBot that are over 3000MHz, with the highest being 4620.2MHz.

Are we sure they didn't switch kits halfway through? That 2666/2800 dip seems to correspond coincidentally with the frequencies that single-sided MFR chips were sold at which had a large bandwidth decrease when compared to dual-sided chips.
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post #33 of 95
in gaming its probably like +1fps i bet
post #34 of 95
Quote:
Originally Posted by jmcosta View Post

in gaming its probably like +1fps i bet
maybe on avg it is, but all those reviews are doing it wrong. RAM speed is supposed to improve the CPU performance in games, so you should rather look at min fps to determine how much it helps.
http://www.overclock.net/t/1487162/an-independent-study-does-the-speed-of-ram-directly-affect-fps-during-high-cpu-overhead-scenarios
post #35 of 95
Quote:
Originally Posted by Klocek001 View Post

Quote:
Originally Posted by jmcosta View Post

in gaming its probably like +1fps i bet
maybe on avg it is, but all those reviews are doing it wrong. RAM speed is supposed to improve the CPU performance in games, so you should rather look at min fps to determine how much it helps.
http://www.overclock.net/t/1487162/an-independent-study-does-the-speed-of-ram-directly-affect-fps-during-high-cpu-overhead-scenarios
Minimum framerate never gets the love it deserves. 2 years ago, a friend benched 1333 Mhz and 2400 MHz DDR3 (and some frequencies inbetween) with various latencies in BF3, and the deltas were pretty high. It's amazing to me how people still buy 1666 MHz kits nowadays with things like CL9 and CL10. Yeah, they're cheap, but they also negate any improvement you would get from upgrading, say, a CPU.
    
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post #36 of 95
Quote:
Originally Posted by ToTheSun! View Post

Minimum framerate never gets the love it deserves. 2 years ago, a friend benched 1333 Mhz and 2400 MHz DDR3 (and some frequencies inbetween) with various latencies in BF3, and the deltas were pretty high. It's amazing to me how people still buy 1666 MHz kits nowadays with things like CL9 and CL10. Yeah, they're cheap, but they also negate any improvement you would get from upgrading, say, a CPU.
the min fps is always the no.1 factor for me when picking a CPU,RAM and GPU. People still say 8350, R9's and 1600 RAM are keeping up well with i5's, 980 and 2133+ RAM. My ass. Look at the min fps and you're gonna see the difference.
post #37 of 95
I ended up buying one of the cheapest kits of 16GB DDR4 I could for my Skylake computer, which happened to be DDR-3000 speed. I knew it was a step down in latency from my Haswell build but the good DDR4 wont be out till next year and I dont want to spend more than $200 on 16GB of RAM so I am just using the cheap stuff till I can get a kit of DDR-4266+ for under $200.


Quote:
Originally Posted by ZealotKi11er View Post

If only AMD APUs has that much memory bandwidth lol.

Ya, AMD really dropped the ball with their Excavator chips and the opportunity to give them a DDR4 memory controller. Of course, the design was so dead to AMD it is easy to see why they didn't put that much work into it and only made it a mobile product anyway. Steamroller APUs came out a little too early to make DDR4 controller viable for them since they were meant for cheaper platforms.
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post #38 of 95
Thread Starter 
Quote:
Originally Posted by xxbassplayerxx View Post

Haswell's memory controller has no problem doing 3000+... I have no idea where they got that idea. There are 381 memory submissions on HWBot that are over 3000MHz, with the highest being 4620.2MHz.

Are we sure they didn't switch kits halfway through? That 2666/2800 dip seems to correspond coincidentally with the frequencies that single-sided MFR chips were sold at which had a large bandwidth decrease when compared to dual-sided chips.

Do any of those results on on HWBot run Aida 64?
post #39 of 95
Quote:
Originally Posted by ToTheSun! View Post

Minimum framerate never gets the love it deserves. 2 years ago, a friend benched 1333 Mhz and 2400 MHz DDR3 (and some frequencies inbetween) with various latencies in BF3, and the deltas were pretty high. It's amazing to me how people still buy 1666 MHz kits nowadays with things like CL9 and CL10. Yeah, they're cheap, but they also negate any improvement you would get from upgrading, say, a CPU.
min FPS doesn't have that XXX factor.
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post #40 of 95
Quote:
Originally Posted by jmcosta View Post

in gaming its probably like +1fps i bet

If the game is CPU limited then RAM speed will matter. If its not then the bottlneck is somewhere else. Its same thing as saying 4GHz CPU vs 5GHz CPU makes no difference in 4K gaming. True but not at 1080p.
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