7900GT same as 7900GTX

Cygnus X1

Senior member
Sep 5, 2005
812
0
71
Is my eVGA 7900GT CO the same exact thing as the 7900GTX just under-volted and a smaller heatsink fan?
 

Effect

Member
Jan 31, 2006
185
0
0
Close, but if i remember right, the 7900gt has different memory (1.4ns?), which isn't easily capable of the high memory clocks on the gtx (1.1ns memory?). Apart from that, and the actual size of memory, yea, they use the same core. (I'm looking forward to the Gainward 7900gt 512mb GLH/golden sample, which is pretty much an undervolted 7900gtx (once again, uses SLIGHTLY slower memory, i think 1.2ns)).

I should prolly add i dont actually know what the 1.xns means, i'm guessing latency (1.2 nano seconds?), but it appears lower number = higher potential memory clocks.
 
Apr 17, 2003
37,622
0
76
Originally posted by: Effect
Close, but if i remember right, the 7900gt has different memory (1.4ns?), which isn't easily capable of the high memory clocks on the gtx (1.1ns memory?). Apart from that, and the actual size of memory, yea, they use the same core. (I'm looking forward to the Gainward 7900gt 512mb GLH/golden sample, which is pretty much an undervolted 7900gtx (once again, uses SLIGHTLY slower memory, i think 1.2ns)).

I should prolly add i dont actually know what the 1.xns means, i'm guessing latency (1.2 nano seconds?), but it appears lower number = higher potential memory clocks.

it determines the speeds of the memory:

1000/ns = rated speed

1000/1.4 =714 mhz rated frequency
1000/1.1 = 910 mhz rated frequency
 

1Dark1Sharigan1

Golden Member
Oct 5, 2005
1,466
0
0
The GTX uses 1.1 ns memory which means it is also higher latency than the 1.4 ns memory used on the GT so a GT that has the same core/mem clocks as a GTX would actually perform better than the GTX becaues of the lower memory latency. Also, the GTX voltage regulators are designed to handle more voltage than the voltage regulators on the GT.
 

Effect

Member
Jan 31, 2006
185
0
0
Originally posted by: Corporate Thug
Originally posted by: Effect
Close, but if i remember right, the 7900gt has different memory (1.4ns?), which isn't easily capable of the high memory clocks on the gtx (1.1ns memory?). Apart from that, and the actual size of memory, yea, they use the same core. (I'm looking forward to the Gainward 7900gt 512mb GLH/golden sample, which is pretty much an undervolted 7900gtx (once again, uses SLIGHTLY slower memory, i think 1.2ns)).

I should prolly add i dont actually know what the 1.xns means, i'm guessing latency (1.2 nano seconds?), but it appears lower number = higher potential memory clocks.

it determines the speeds of the memory:

1000/ns = rated speed

1000/1.4 =714 mhz rated frequency
1000/1.1 = 910 mhz rated frequency


Thanks for that =). I think i've heard that before. In any case, it cleared things up.
 

ElFenix

Elite Member
Super Moderator
Mar 20, 2000
102,414
8,356
126
Originally posted by: firewolfsm
why is it 1000?

1000 mhz = 1 billion/sec, 1 ns = 1/billion of a second. the math works out that way.
 

aatf510

Golden Member
Nov 13, 2004
1,811
0
0
Also, the GTX uses the more expensive 7800GTX 512MB PCB, and that is why the GTX is longer.