The Gigabyte GV-NX78X256V-B is already a smoking fast
videocard but of course we'd never leave well enough alone. ;-) Starting with
the core which is clocked at 430 MHz when running in 3D mode I slowly raised its
clock speed a few MHz at a time....
Things went by pretty smoothly and we easily broke the 450, 460 and 470 MHz
mark without any problems. The Gigabyte GV-NX78X256V-B seemed to be up to the
overclocking challenge and the core hit 507 MHz before things started to go
crazy. Anything higher and visual artifacts would start to appear on the screen
when running 3DMark05 or the CodeCreatures benchmark. During overclocking, the
fan speed did not increase one bit, and so the card was still very
At 1200 MHz, the memory is already clocked pretty darn
fast but with Gigabyte equipping the card with Samsung GC16 GDDR3 BGA DRAM
modules, I was hoping for more. Jumping up in about 10 MHz intervals, the
GV-NX78X256V-B easily cracked the 1300 MHz mark and went as high as 1378 MHz
before artifacts started to show up.
Separating itself from the Albatron GeForce 7800GTX which PCSTATS reviewed previously,
the Gigabyte GV-NX78X256V-B's core and memory had no problems running at maximum
clock speed. When monitoring the core speeds however we did notice something
Interesting Clock Speed Phenomenon
If you haven't guessed RivaTuner is my favorite videocard overclocking/tweaking
utility simply because it's so powerful. One thing I noticed while testing the
GV-NX78X256V-B videocard was that the RivaTuner (version 2.0 15.6RC) would
report that the G70 core was running approximately 40 MHz higher than default
(470 MHz as oppose to 430 MHz). After reading this news blurb over at Guru3D, I realized that this was not
an isolated incident and occurs when the videocard is overclocked as well!
At stock, Rivatuner
reports that the core runs at 470 MHz.
RivaTuner Reports OC
core clock speed ~40 MHz higher
We've contacted nVIDIA about this
curious issue, but are currently waiting for a reply. Once we get the
word, we'll pass it along.
|PCStats Test System Specs:|
AMD Athlon64 4000+
12 x 200 MHz = 2.4 GHz
DFI LANParty NF4 SLI-DR (NF4-SLI)
Radeon X800 XL
PowerColor X700 PRO
PowerColor Bravo X700
GeForce 7800 GTX SLI
Albatron GeForce 7800 GTX
MSI NX6800-TD128E (Single)
Gigabyte GV-3D1 (Single Mode)
Gigabyte GV-3D1 (SLI
MSI NX6600GT-TD128E (Single Mode)
2x 512MB Mushkin PC3200 L2 V2
||74GB WD Raptor 10k RPM SATA HDD|
||AOpen 52x Combo|
||Seasonic Super Tornado 400W|
||Prometeia Mach II GT (review)|
WindowsXP Build 2600
Gun Metal 2
AA Test, AF and AA+AF Test
The AGP and
PCI-E systems use a different motherboard but results are shown for reference.
Unfortunately there are no AquaMark3 numbers for this review, we could not get
the benchmark working.