1.42 GHz 7455s (XC7455B1400PF)
I'm glad somebody finally peeled the heatsink off one of these so we could see the stamp on the chips... www.hardmac.com
So...
XC = pilot production prototype (bleeding edge)
7455 = 7455 part
B = revised process (I wonder what changed)
RX = CBGA package
1400 = 1400 MHz
P = 1.85V core voltage, 0-65C operating temps
F = revision 3.3
So...
XC = pilot production prototype (bleeding edge)
7455 = 7455 part
B = revised process (I wonder what changed)
RX = CBGA package
1400 = 1400 MHz
P = 1.85V core voltage, 0-65C operating temps
F = revision 3.3
Comments
Originally posted by mrmister
Care to do any analysis?
Not much to analyze, errata fixes, mostly? The "B" is intriguing.
This does prove the 1.42 GHz Power Macs are using 7455s though...some people needed to be convinced they weren't 7457s. This also disproves once again the claim that Apple is overclocking Moto CPUs beyond their rated clockspeeds.
Originally posted by Eugene
This also disproves once again the claim that Apple is overclocking Moto CPUs beyond their rated clockspeeds.
Obviously my math isn't very good: I could have sworn that 1.42 GHz isn't quite the same as 1400 MHz...
I like the blue board too, looks spiffy.
Originally posted by Overhope
Obviously my math isn't very good: I could have sworn that 1.42 GHz isn't quite the same as 1400 MHz...
I don't that Apple would even think about overclocking if the result is a 20 MHz bump
167 MHz system bus * 8,5 = 1,419.5 MHz.
No wonder those chips are cooled by Mount Heatsink.
Originally posted by Amorph
1.85 volts?! Wow, they might as well mount a turbo on the thing.
No wonder those chips are cooled by Mount Heatsink.
The 1 GHz and 1.25 GHz MDD macs were 1.85V too. Where have you been?
Originally posted by Eugene
The 1 GHz and 1.25 GHz MDD macs were 1.85V too. Where have you been?
Excuse me if I don't check processor voltages religiously.
That's pretty damn high for a Mot processor, isn't it?
Originally posted by Amorph
Excuse me if I don't check processor voltages religiously.
That's pretty damn high for a Mot processor, isn't it?
That's pretty damn high, yeah! The 7457 is 1,3V, and the low-power version 1V, rated at 12,6W and 7,5W @ 1GHz respectively.
Originally posted by r-0X#Zapchud
That's pretty damn high, yeah! The 7457 is 1,3V, and the low-power version 1V, rated at 12,6W and 7,5W @ 1GHz respectively.
There are 1.3V, 1.6V and 1.85V 7455s. So far there are 1.1V and 1.3V 7457s listed, but I'd bet there's also a 1.5V+ version out there...
Originally posted by Eugene
There are 1.3V, 1.6V and 1.85V 7455s. So far there are 1.1V and 1.3V 7457s listed, but I'd bet there's also a 1.5V+ version out there...
Yep, so do I think too. If Apple are planning to use higher-speed 7457's, they will need higher voltage than 1.3
Most notably these 7455s are rated up to 75C operating temps.
http://developer.apple.com/techpubs/...cG4/index.html
U2 supported 1394b all along. They were probably waiting for the PHYs to be released.
I'm not sure why it uses a PCI USB controller since KeyLargo has USB.
Originally posted by wmf
U2 supported 1394b all along. They were probably waiting for the PHYs to be released.
Not surprising. The red eBay motherboard that appeared before the original MDD Power Macs were released had the FireWire 800 connector. I just assumed 1394b support was there, just without the appropriate connector fitted to the board.