RichM499
Daemon Poster
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my athlon x2 5400+ has a stock multiplier of 14x
if i run my ram at 800mhz (which i do....) at 14x and 2800mhz, the divider is 7
so that means 2800/7=400, it makes sense
i decided to do some tests, and i came up with this
all tests were with the memory set to 800mhz DDR in bios @ stock FSB of 200mhz
2800mhz core, 14x multiplier = cpu/7 (400mhz ram,)
3000mhz core, 15x multiplier = cpu/8 (375mhz ram,)
3100mhz core, 15.5x multiplier = cpu/8 (387.5mhz ram)
3200mhz core, 16x multiplier = cpu/8 (400mhz ram)
3300mhz core, 16.5x multiplier = cpu/8 (412.5mhz ram)
3400mhz core, 17x multiplier = cpu/9 (377mhz ram)
As you can see, the divider increases with the multiplier=)
so to test my ram, i set it at 220mhz FSB, x 14 multiplier (440mhz ram@ 2.0v) 3080mhz
core
-- the memory is only rated for 1.9v, so im not sure if i can get 2.1 safely or not --
and it worked=D 100% stable. unfortunately the core speed is only 3080mhz...
So it seems, 16x, and 14x multipliers are going to be my ticket for best ram / cpu frequencies
(and the drop in core frequency was NOT countered by the ram frequency,
at 3080 / 440ram my Superpi time is 30.592s.. almost 3 seconds SLOWER than my best!)
I am going to increase the FSB to 225, test the ram, and increase it 1mhz at a time after that.
Hopefully i can get the core clock back up to 3300mhz (470mhz ram) @ 235 FSB.
=P either way, i am 100% sure that 1 of 2 things is going to happen.
1. im going to be limited by my ram.
2. im going to be limited by my CPU core @ 16x multiplier (3330mhz~ is my top stable)
=)
Hopefully someone will happen across this with a Black Edition athlon x2, and wont have to go through the research like i did.
UPDATE:
I got the ram stable at 450mhz, but im not sure if i can go any higher.
3150mhz core@1.48v/14x multi (i can drop this to 1.4v if i dont get it back up to 3300), 225mhz fsb, 900mhz HyperTransport, 450mhz ram@2.08v.
This ram is Corsair XMS2 DDR2 800mhz 1.9v@ 900mhz 2.08v.... what do you think?=) should i push for 2.13v and 460mhz?
if i run my ram at 800mhz (which i do....) at 14x and 2800mhz, the divider is 7
so that means 2800/7=400, it makes sense
i decided to do some tests, and i came up with this
all tests were with the memory set to 800mhz DDR in bios @ stock FSB of 200mhz
2800mhz core, 14x multiplier = cpu/7 (400mhz ram,)
3000mhz core, 15x multiplier = cpu/8 (375mhz ram,)
3100mhz core, 15.5x multiplier = cpu/8 (387.5mhz ram)
3200mhz core, 16x multiplier = cpu/8 (400mhz ram)
3300mhz core, 16.5x multiplier = cpu/8 (412.5mhz ram)
3400mhz core, 17x multiplier = cpu/9 (377mhz ram)
As you can see, the divider increases with the multiplier=)
so to test my ram, i set it at 220mhz FSB, x 14 multiplier (440mhz ram@ 2.0v) 3080mhz
core
-- the memory is only rated for 1.9v, so im not sure if i can get 2.1 safely or not --
and it worked=D 100% stable. unfortunately the core speed is only 3080mhz...
So it seems, 16x, and 14x multipliers are going to be my ticket for best ram / cpu frequencies
(and the drop in core frequency was NOT countered by the ram frequency,
at 3080 / 440ram my Superpi time is 30.592s.. almost 3 seconds SLOWER than my best!)
I am going to increase the FSB to 225, test the ram, and increase it 1mhz at a time after that.
Hopefully i can get the core clock back up to 3300mhz (470mhz ram) @ 235 FSB.
=P either way, i am 100% sure that 1 of 2 things is going to happen.
1. im going to be limited by my ram.
2. im going to be limited by my CPU core @ 16x multiplier (3330mhz~ is my top stable)
=)
Hopefully someone will happen across this with a Black Edition athlon x2, and wont have to go through the research like i did.
UPDATE:
I got the ram stable at 450mhz, but im not sure if i can go any higher.
3150mhz core@1.48v/14x multi (i can drop this to 1.4v if i dont get it back up to 3300), 225mhz fsb, 900mhz HyperTransport, 450mhz ram@2.08v.
This ram is Corsair XMS2 DDR2 800mhz 1.9v@ 900mhz 2.08v.... what do you think?=) should i push for 2.13v and 460mhz?