HIS Radeon HD 7770 GHz Edition Graphics Card Review



Product: HIS Radeon HD 7770 GHz Edition
Company: HIS
Author: James Prior
Editor: Charles Oliver
Date: October 25th, 2012

Test System & Overclocking

Our test platform is as detailed below:

Test Platform

Component Specification
Mainboard ASUS P8P67 WS Revolution
Processor Core i7-2600K
Graphics Card HIS Radeon HD 7770 iCooler
  AMD Radeon HD 7770
Memory 4x2GB G-Skill RipJaws DDR3-1333 8-8-8-24 3T
Audio Realtek ALC892
PSU Corsair HX850
Case CoolerMaster HAF X w/Adt'l 200mm Top Exhaust
OS Drive Samsung 830 128GB SSD
Storage Drive Seagate 7200.12 1TB
Heatsink/Fan Noctua NH-D14
Display ASUS VG-236 24"
Operating System Windows 7 64-bit Ultimate SP1
Driver Catalyst 12.9b CAP 1
HIS HD 7770 iCooler

Product Specification Comparison

  HIS HD 7770 iCooler HD 7770 Ref
SEP (USD) $129 (-$15MIR) $109
Engine Clock 1000Mhz 1000MHz
Cores 640 640
Architecture Cape Verde GCN Cape Verde GCN
Memory Capacity 1GB 1GB
Memory Speed 1125MHz / 4.5Gbps QDR 1125MHz / 4.5Gbps QDR
Bus Width 128-bit 128-bit
Power [Idle/Avg/Limit] <3W / 80W / 100W <3W / 80W / 100W

Overclocking

We used HIS iTurbo software for overclocking, which allows voltage control and powertune adjustment from a single interface. Our AMD Radeon HD 7770 engineering sample maxed out the engine clock at 1160MHz using 1.274v and 1275MHz on the memory, at 16% increase on the core and 13% increase on the memory. The HIS HD Radeon HD 7770 went further with less, running 1220MHz @ 1.262v on the engine clock. The memory was able to hit 1600MHz when not overclocking the core, but combining the memory and engine overclocks dropped this to 1490MHz. This gives a final increase of 22% on the engine and 32% on the memory clock.

Stock HD 7770
iCooler Overclock
  HIS HD 7770 iCooler Overclock Increase
Engine Clock 1000Mhz 1220MHz +22%
Memory Speed 1125MHz / 4.5Gbps QDR 1490MHz / 5.96Gbps QDR +32%

Multi-GPU is also supported on these cards, running with two cards in alternate frame render mode - CrossFireX. In this mode we opted to keep both cards at their individual OCs, running different clocks. Overclocking in Crossfire requires disabling AMD's ultra-low power state (ULPS) ability, which increase idle power draw.

HD 7770 CrossFireX